diff --git a/changelogs/fragments/454-sns_topic_fix_sms_endpoint_canonicalization.yaml b/changelogs/fragments/454-sns_topic_fix_sms_endpoint_canonicalization.yaml
new file mode 100644
index 00000000000..fd4cf415cef
--- /dev/null
+++ b/changelogs/fragments/454-sns_topic_fix_sms_endpoint_canonicalization.yaml
@@ -0,0 +1,2 @@
+bugfixes:
+  - sns_topic - Add ``+`` to allowable characters in SMS endpoints (https://github.com/ansible-collections/community.aws/pull/454).
diff --git a/plugins/modules/sns_topic.py b/plugins/modules/sns_topic.py
index 79070cbabc5..1be60a38ec9 100644
--- a/plugins/modules/sns_topic.py
+++ b/plugins/modules/sns_topic.py
@@ -349,8 +349,11 @@ def _set_topic_attrs(self):
         return changed
 
     def _canonicalize_endpoint(self, protocol, endpoint):
+        # AWS SNS expects phone numbers in
+        # and canonicalizes to E.164 format
+        # See <https://docs.aws.amazon.com/sns/latest/dg/sms_publish-to-phone.html>
         if protocol == 'sms':
-            return re.sub('[^0-9]*', '', endpoint)
+            return re.sub('[^0-9+]*', '', endpoint)
         return endpoint
 
     def _set_topic_subs(self):