Yes, I’m using editor.p5js.org The term sandbox is used in its normal form: an area where work can be done independent or other sandboxes (in this case other logins). Sandboxes are often hosted in the cloud, assuming the cloud server handles independent logins. I’m not sure you could serve p5js locally on a Chromebook. You’d need some sort of custom Chrome plugin, and a cloud server to provide database services.
So let me ask the question a little more succinctly: Can I duplicate a sketch across multiple logins in editor.p5js.org? I know I can duplicate a sketch in my own (teacher) login. But that doesn’t get it to the student’s login.
-Peter