I asked to my college about this and they replied
“There are no rules against doing your quarantine in another province. However, you still need to make sure you write a quarantine plan and follow all Government of Canada recommendations. Additionally, you will need to make sure you have health insurance as you are not covered by the Saskatchewan health plan while living in another province.
Additionally, you will need to provide us with a copy of your flight itinerary, as well as, your quarantine plan.”