diff --git a/addons/project_sms/models/project_task.py b/addons/project_sms/models/project_task.py
index ff7e4d7b096..32461038f67 100644
--- a/addons/project_sms/models/project_task.py
+++ b/addons/project_sms/models/project_task.py
@@ -20,6 +20,11 @@ class ProjectTask(models.Model):
 
     def write(self, vals):
         res = super().write(vals)
+
         if 'stage_id' in vals:
-            self._send_sms()
+            if self.env.user.has_group('base.group_portal') and not self.env.su:
+                # sudo as sms template model is protected
+                self.sudo()._send_sms()
+            else:
+                self._send_sms()
         return res
diff --git a/addons/project_sms/tests/__init__.py b/addons/project_sms/tests/__init__.py
new file mode 100644
index 00000000000..3891365e24c
--- /dev/null
+++ b/addons/project_sms/tests/__init__.py
@@ -0,0 +1,4 @@
+# -*- coding: utf-8 -*-
+# Part of Odoo. See LICENSE file for full copyright and licensing details.
+
+from . import test_project_sharing
diff --git a/addons/project_sms/tests/test_project_sharing.py b/addons/project_sms/tests/test_project_sharing.py
new file mode 100644
index 00000000000..717eb04524d
--- /dev/null
+++ b/addons/project_sms/tests/test_project_sharing.py
@@ -0,0 +1,31 @@
+# -*- coding: utf-8 -*-
+# Part of Odoo. See LICENSE file for full copyright and licensing details.
+
+from odoo import Command
+from odoo.addons.project.tests.test_project_sharing import TestProjectSharingCommon
+
+
+class TestProjectSharingWithSms(TestProjectSharingCommon):
+    @classmethod
+    def setUpClass(cls):
+        super().setUpClass()
+
+        cls.sms_template = cls.env['sms.template'].sudo().create({
+            'body': '{{ object.name }}',
+            'model_id': cls.env['ir.model'].sudo().search([('model', '=', 'project.task')]).id,
+        })
+        cls.project_portal.type_ids[-1].write({'sms_template_id': cls.sms_template.id})
+        cls.project_portal.write({
+            'collaborator_ids': [
+                Command.create({'partner_id': cls.user_portal.partner_id.id}),
+            ],
+        })
+
+    def test_portal_user_can_change_stage_with_sms_template(self):
+        """ Test user portal can change the stage of a task to a stage with a sms template
+
+            The sms template should be sent and the stage should be changed on the task.
+        """
+        stage = self.project_portal.type_ids[-1]
+        self.task_portal.with_user(self.user_portal).write({'stage_id': stage.id})
+        self.assertEqual(self.task_portal.stage_id, stage)