diff --git a/ccm-core-apiclient/src/main/typescript/clients/sites-api.ts b/ccm-core-apiclient/src/main/typescript/clients/sites-api.ts
new file mode 100644
index 000000000..1115df386
--- /dev/null
+++ b/ccm-core-apiclient/src/main/typescript/clients/sites-api.ts
@@ -0,0 +1,247 @@
+import {
+    ApiResponse,
+    LibreCcmApiClient,
+    ListView,
+} from "@libreccm/ccm-apiclient-commons";
+
+import { buildIdentifierParam } from "@libreccm/ccm-apiclient-commons";
+
+import * as Constants from "../constants";
+
+import { Site, buildSiteFromRecord } from "../entities/site";
+import {
+    CcmApplicationId,
+    buildCcmApplicationIdFromRecord,
+} from "../entities/web";
+
+/**
+ * Client for managing sites using the RESTful API
+ */
+export class SitesApiClient {
+    #apiClient: LibreCcmApiClient;
+
+    readonly #SITES_API_PREFIX = `${Constants.ADMIN_API_PREFIX}/sites`;
+
+    constructor(apiClient: LibreCcmApiClient) {
+        this.#apiClient = apiClient;
+    }
+
+    async getSites(limit: number, offset: number): Promise<ListView<Site>> {
+        try {
+            const response: ApiResponse = await this.#apiClient.get(
+                `${this.#SITES_API_PREFIX}`,
+                {
+                    limit: limit.toString(),
+                    offset: offset.toString(),
+                }
+            );
+            if (response.ok) {
+                const result: Record<
+                    string,
+                    unknown
+                > = (await response.json()) as Record<string, unknown>;
+                const list: Record<string, unknown>[] = result.list as Record<
+                    string,
+                    unknown
+                >[];
+                const sites: Site[] = list.map((record) =>
+                    buildSiteFromRecord(record)
+                );
+
+                return {
+                    list: sites,
+                    count: result.count as number,
+                    limit: result.limit as number,
+                    offset: result.offset as number,
+                };
+            } else {
+                throw `Failed to get sites: 
+                ${response.status} ${response.statusText}`;
+            }
+        } catch (err) {
+            throw `Failed to get sites: ${err}`;
+        }
+    }
+
+    async getSite(siteIdentifier: string | number): Promise<Site> {
+        try {
+            const response: ApiResponse = await this.#apiClient.get(
+                `${this.#SITES_API_PREFIX}/${buildIdentifierParam(
+                    siteIdentifier
+                )}`
+            );
+            if (response.ok) {
+                return buildSiteFromRecord(
+                    (await response.json()) as Record<string, unknown>
+                );
+            } else {
+                throw `Failed to get site ${siteIdentifier}: 
+                ${response.status} ${response.statusText}`;
+            }
+        } catch (err) {
+            throw `Failed to get site ${siteIdentifier}: ${err}`;
+        }
+    }
+
+    async addSite(site: Site): Promise<string> {
+        try {
+            const response: ApiResponse = await this.#apiClient.post(
+                `${this.#SITES_API_PREFIX}`,
+                JSON.stringify(site)
+            );
+            if (response.ok) {
+                return site.domainOfSite;
+            } else {
+                throw `Failed to add site ${site.domainOfSite}: 
+                ${response.status} ${response.statusText}`;
+            }
+        } catch (err) {
+            throw `Failed to add site ${site.domainOfSite}: ${err}`;
+        }
+    }
+
+    async updateSite(
+        siteIdentifier: string | number,
+        site: Site
+    ): Promise<void> {
+        try {
+            const response: ApiResponse = await this.#apiClient.put(
+                `${this.#SITES_API_PREFIX}/${buildIdentifierParam(
+                    siteIdentifier
+                )}`,
+                JSON.stringify(site)
+            );
+            if (response.ok) {
+                return;
+            } else {
+                throw `Failed to update site ${siteIdentifier}: 
+                ${response.status} ${response.statusText}`;
+            }
+        } catch (err) {
+            throw `Failed to update site ${siteIdentifier}: ${err}`;
+        }
+    }
+
+    async deleteSite(siteIdentifier: string | number): Promise<void> {
+        try {
+            const response: ApiResponse = await this.#apiClient.delete(
+                `${this.#SITES_API_PREFIX}/${buildIdentifierParam(
+                    siteIdentifier
+                )}`
+            );
+            if (response.ok) {
+                return;
+            } else {
+                throw `Failed to delete site ${siteIdentifier}: 
+                ${response.status} ${response.statusText}`;
+            }
+        } catch (err) {
+            throw `Failed to delete site ${siteIdentifier}: ${err}`;
+        }
+    }
+
+    async getApplications(
+        siteIdentifier: string | number,
+        limit: number,
+        offset: number
+    ): Promise<ListView<CcmApplicationId>> {
+        try {
+            const siteParam = buildIdentifierParam(siteIdentifier);
+
+            const response: ApiResponse = await this.#apiClient.get(
+                `${this.#SITES_API_PREFIX}/${siteParam}/applications`,
+                {
+                    limit: limit.toString(),
+                    offset: offset.toString(),
+                }
+            );
+            if (response.ok) {
+                const result: Record<
+                    string,
+                    unknown
+                > = (await response.json()) as Record<string, unknown>;
+                const list: Record<string, unknown>[] = result.list as Record<
+                    string,
+                    unknown
+                >[];
+                const applications: CcmApplicationId[] = list.map((record) =>
+                    buildCcmApplicationIdFromRecord(record)
+                );
+
+                return {
+                    list: applications,
+                    count: result.count as number,
+                    limit: result.limit as number,
+                    offset: result.limit as number,
+                };
+            } else {
+                throw `Failed to get applications of 
+                site ${siteIdentifier}: 
+                ${response.status} ${response.statusText}`;
+            }
+        } catch (err) {
+            throw `Failed to get applications of 
+            site ${siteIdentifier}: ${err}`;
+        }
+    }
+
+    async addApplication(
+        siteIdentifier: string | number,
+        applicationIdentifier: string | number
+    ): Promise<void> {
+        try {
+            const siteParam: string = buildIdentifierParam(siteIdentifier);
+            const applicationParam: string = buildIdentifierParam(
+                applicationIdentifier
+            );
+
+            const response: ApiResponse = await this.#apiClient.put(
+                `${
+                    this.#SITES_API_PREFIX
+                }/${siteParam}/groups/${applicationParam}`
+            );
+            if (response.ok) {
+                return;
+            } else {
+                throw `Failed to add application ${applicationIdentifier}  
+                to site 
+                ${siteIdentifier}: 
+                ${response.status} ${response.statusText}`;
+            }
+        } catch (err) {
+            throw `Failed to add application ${applicationIdentifier}  
+            to site 
+            ${siteIdentifier}: ${err}`;
+        }
+    }
+
+    async removeApplication(
+        siteIdentifier: string | number,
+        applicationIdentifier: string | number
+    ): Promise<void> {
+        try {
+            const siteParam: string = buildIdentifierParam(siteIdentifier);
+            const applicationParam: string = buildIdentifierParam(
+                applicationIdentifier
+            );
+
+            const response: ApiResponse = await this.#apiClient.delete(
+                `${
+                    this.#SITES_API_PREFIX
+                }/${siteParam}/groups/${applicationParam}`
+            );
+            if (response.ok) {
+                return;
+            } else {
+                throw `Failed to remove application ${applicationIdentifier}  
+            fromsite 
+            ${siteIdentifier}: 
+            ${response.status} ${response.statusText}`;
+            }
+        } catch (err) {
+            throw `Failed to remove application ${applicationIdentifier}  
+        from site 
+        ${siteIdentifier}: ${err}`;
+        }
+    }
+}
diff --git a/ccm-core-apiclient/src/main/typescript/entities/site.ts b/ccm-core-apiclient/src/main/typescript/entities/site.ts
new file mode 100644
index 000000000..bc21f78f1
--- /dev/null
+++ b/ccm-core-apiclient/src/main/typescript/entities/site.ts
@@ -0,0 +1,38 @@
+/**
+ * Entities used by the RESTful API for managing sites
+ * @packageDocumentation
+ */
+
+import { assertProperties } from "@libreccm/ccm-apiclient-commons";
+
+export interface Site {
+    siteId: number;
+    uuid: string;
+    domainOfSite: string;
+    defaultSite: string;
+    defaultTheme: string;
+}
+
+export interface SiteId {
+    siteId: number;
+    uuid: string;
+    domainOfSite: string;
+}
+
+export function buildSiteFromRecord(record: Record<string, unknown>): Site {
+    assertProperties(record, [
+        "siteId",
+        "uuid",
+        "domainOfSite",
+        "defaultSite",
+        "defaultTheme",
+    ]);
+
+    return {
+        siteId: record.siteId as number,
+        uuid: record.uuid as string,
+        domainOfSite: record.domainOfSite as string,
+        defaultSite: record.defaultSite as string,
+        defaultTheme: record.defaultTheme as string,
+    };
+}
diff --git a/ccm-core-apiclient/src/main/typescript/entities/web.ts b/ccm-core-apiclient/src/main/typescript/entities/web.ts
new file mode 100644
index 000000000..154c946fa
--- /dev/null
+++ b/ccm-core-apiclient/src/main/typescript/entities/web.ts
@@ -0,0 +1,25 @@
+/**
+ * Entities used to manage application instances using the RESTful API.
+ * @packageDocumentation
+ */
+
+import {
+    LocalizedString,
+    assertProperties,
+} from "@libreccm/ccm-apiclient-commons";
+
+export interface CcmApplicationId {
+    applicationType: string;
+    primaryUrl: string;
+}
+
+export function buildCcmApplicationIdFromRecord(
+    record: Record<string, unknown>
+): CcmApplicationId {
+    assertProperties(record, ["applicationType", "primaryUrl"]);
+
+    return {
+        applicationType: record.applicationType as string,
+        primaryUrl: record.primaryUrl as string,
+    };
+}