Hi, @mary_drylie 
Welcome to the Canvas Community! "Sandbox" is one of the generic terms users of Canvas use to describe a blank or practice course shell. If you aren't able to locate it in by clicking on Courses in the global navigation menu and then All Courses, please ask your local district Canvas admin or eLearning department for additional guidance.
This discussion post is outdated and has been archived. Please use the Community question forums and official documentation for the most current and accurate information.