You can allow users who are not part of the SFU community to access your Canvas course. You would add and create an external account. Add an external account to your course as an observer, a teacher, or a student. Please note their email address would show up in discussions so you should have them change their display name. See How do I customize my Canvas settings?

1. Click People on the side navigation bar.

2. Click + People

3. [1] Choose Email Address

[2] Enter the email address

[3] Choose the role

[4] Choose the section

[5] Choose Next

6. Click Add Users

You will see the user listed.

The user will be sent an invitation. Please note the user won't receive the invitation until the course is published.