Hello fadegbulu and welcome to the Community. @Chris_Hofer answered a similar question this way.
"A "sandbox" course would typically be set up by your school's local Canvas administrator for you to use how you want. I would recommend that you reach out to this person or your school's Online Learning/eLearning department at your school to get more information on this. Hopefully, they will be able to help you out with this request.
If the "sandbox" course has already been set up for you, you might have to look for it in your "All Courses" view of Canvas. How do I view all my Canvas courses as an instructor?"
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