In some cases, if it’s been less than 90 days since your visitor status expired, you can apply to restore it.
Use your document checklist to get the forms and documents you need. When you complete the Application to Change Conditions or Extend Your Stay in Canada as a Visitor (IMM 5708), make sure you:
Select Restore my status as a visitor (under section 3 at the top of the form).
Give details of your situation and the reason you stayed in Canada longer than allowed (under section 2 of the background information).
You must also pay the restoration fee.
There is no guarantee that your application will be approved.