diff --git a/sandbox.md b/sandbox.md
new file mode 100644
index 000000000..dc5dcc8e6
--- /dev/null
+++ b/sandbox.md
@@ -0,0 +1,26 @@
+# Sandbox Environment 
+
+## Description
+
+The `sandbox` branch creates a long-living multidev that provides a permanently available sandbox environment that mirrors production where editors can safely practice and use the CMS without fear of messing up the live site. 
+
+This environment can be used for guided training classes, self learning, or experimentation, etc.
+
+## Environment Updates
+
+This environment should be a replica of the live site so it needs to be updated as part of the deployment process in order to stay in sync with the live site.
+
+Run these commands to keep this branch up to date:
+
+```
+git checkout sandbox
+git rebase origin/master
+git push -f
+```
+
+## Code Changes
+
+This branch should only have a few code changes from the `master` branch:
+1. `sandbox.md` (This file)
+2. `web/modules/custom/portland_openid_connect/src/Routing/RouteSubscriber.php` (Enabling Office 365 login for this site)
+3. `web/sites/default/settings.php` (Define environment indicator for Sandbox)
diff --git a/web/modules/custom/portland_openid_connect/src/Routing/RouteSubscriber.php b/web/modules/custom/portland_openid_connect/src/Routing/RouteSubscriber.php
index 19ad57b74..fe2951455 100644
--- a/web/modules/custom/portland_openid_connect/src/Routing/RouteSubscriber.php
+++ b/web/modules/custom/portland_openid_connect/src/Routing/RouteSubscriber.php
@@ -63,7 +63,7 @@ protected function alterRoutes(RouteCollection $collection) {
       in_array($_ENV['PANTHEON_ENVIRONMENT'], [
         // uncomment this line for local testing
         //'lando', 
-        'demo', 'dev', 'test', 'live','pe-380'])
+        'demo', 'dev', 'test', 'live','sandbox'])
     ) {
       // only log in with an OpenID provider
       if ($route = $collection->get('user.login')) {
diff --git a/web/sites/default/settings.php b/web/sites/default/settings.php
index f0198697d..54dfd0434 100644
--- a/web/sites/default/settings.php
+++ b/web/sites/default/settings.php
@@ -52,6 +52,13 @@
     $config['environment_indicator.indicator']['fg_color'] = '#ffffff';
     $config['environment_indicator.indicator']['name'] = 'Test';
   }
+  elseif ($_ENV['PANTHEON_ENVIRONMENT'] === 'sandbox') {
+    /** Replace www.example.com with your registered domain name */
+    $primary_domain = 'sandbox.employees.portland.gov';
+    $config['environment_indicator.indicator']['bg_color'] = '#ffb81c';
+    $config['environment_indicator.indicator']['fg_color'] = '#ffffff';
+    $config['environment_indicator.indicator']['name'] = 'Sandbox';
+  }
   elseif ($_ENV['PANTHEON_ENVIRONMENT'] === 'lando') {
     /** Replace www.example.com with your registered domain name */
     $primary_domain = 'employees.lndo.site';