A work visa. Your employer will need to get a LMIA and pay $1k. This will take many months. Then you can apply for a work permit and depending where you live another several month.
All internships are subject to the following guiding principles:
Foreign nationals registered at foreign educational institutions (i.e., not enrolled in a Canadian designated learning institution) and wishing to come to Canada to complete an internship or undertake a position in research programs are considered temporary foreign workers under the IRPR. Examples include foreign nationals funded by research organizations such as Mitacs.
Under the IRPA and IRPR, foreign nationals who seek authorization to work in Canada (whether or not they are remunerated) must obtain a work permit, unless they are exempt from the requirement pursuant to section R186.
Employers of foreign nationals, including interns who are not work permit-exempt under section R186, must obtain a positive Labour Market Impact Assessment (LMIA) from Employment and Social Development Canada (ESDC), unless they are LMIA-exempt under the IRPR [R204 to 208]. Even if the employment is LMIA-exempt, employers are required to submit the offer of employment directly to Immigration, Refugees and Citizenship Canada (IRCC) and to pay the employer compliance fee before the foreign national submits their work permit application.
