Do you keep a home some where outside Canada?
https://students.ubc.ca/enrolment/finances/taxes/filing-taxes-canada
Do international students file taxes?
Most international students “file a tax return” (submit an income tax form to the government) to receive tax credits (money from governments or the chance to lower taxes later). International students may have to pay Canadian income tax on income earned from teaching and/or research assistantships, other employment, and investment and business income. Generally, students also have to report income they receive from outside of Canada.
The Canadian tax system is based on residency, not citizenship. Students from countries that have a tax treaty with Canada may not have to pay Canadian income tax and may be able to request that their employer stop withholding tax from their Canadian employment income with permission from CRA.
https://www.canada.ca/en/revenue-agency/services/tax/international-non-residents/individuals-leaving-entering-canada-non-residents/international-students-studying-canada.html
What are residential ties?
Significant residential ties to Canada include:
a home in Canada
a spouse or common-law partner in Canada
dependants in Canada
Secondary residential ties that may be relevant include:
personal property in Canada, such as a car or furniture
social ties in Canada, such as memberships in Canadian recreational or religious organizations
economic ties in Canada, such as Canadian bank accounts or credit cards
a Canadian driver's licence
a Canadian passport
health insurance with a Canadian province or territory
The information above is general in nature. For more information on your residential ties, see Income Tax Folio S5-F1-C1, Determining an Individual's Residence Status.
Determining your residency status?
In general, you probably have not established significant residential ties with Canada if you:
return to your home country on a periodic basis or for a significant amount of time in the calendar year
move to another country when not attending university in Canada
However, many international students who study or carry on research in Canada do establish significant residential ties with Canada.
Resident of Canada
You are a resident of Canada for income tax purposes if you establish significant residential ties with Canada.