Technically yes, according to this link:
https://www.canada.ca/en/immigratio.../coronavirus-covid19/students.html#exemptions
Since you have a study permit from before March 18 and an essential reason (no internet), you should be able to. However, you must come prepared with proof of some sort and state exactly why you can’t stay in your home country. Read through the link above and find out what else might be helpful (such as already having a place of residence in Canada). You must be convincing and honest. However, I’ve heard cases of people trying this even with everything you have, and being sent back home or not allowed to get on the plane in the first place.