팬더믹이 시작된 이후로 외국에서 캐나다로 들어오는 것이 힘들어졌었다. 처음에는 중국의 일로만 알다가 그 이후에는 전 세계적으로 퍼져서 환자들이 발생하면서 외국인 입국 금지 조치가 이루어졌었고 지금은 허가 받고 C19 바이러스 감염 검사를 출발 전 72시간 이내에 확인한 확인서를 제출해야 입국 할 수 있다고 들었다.

https://www.aircanada.com/kr/ko/aco/home/book/travel-news-and-updates/2020/covid-19.html#/entryRequirements

The Government of Canada has restricted non-essential travel of foreign nationals across its border.

Foreign nationals (a person who is not a Canadian citizen or a permanent resident) wishing to enter Canada by air for optional, non-essential or discretionary purposes will not be permitted. Non-essential travel includes travelling for tourism, sightseeing, recreation, entertainment, social visits and religious functions.

Before you travel, please ensure you understand the requirements for entering Canada

ArriveCAN must be used prior arrival in Canada to provide mandatory contact details, booking confirmation of your pre-paid 3-night stay at a government-authorized accommodation and quarantine plan information. Failure to do so may result in a fine.

After entry into Canada, you will be required to report your symptoms daily. You may be contacted by the Government of Canada and provincial/territorial officers throughout your quarantine period.

Passengers 5 years of age or older must provide a negative COVID-19 molecular test prior to boarding. The test must be taken within 72 hours prior departure. Find a testing location.

You do not need to provide a negative COVID-19 test if:

You are only transiting through a Canadian airport from one international destination to another, without entering Canada.
You have recovered from COVID-19 but continue to test positive long after you have recovered and are no longer infectious. You must provide proof of a positive COVID-19 molecular test conducted between 15 and 90 days prior to your entry into Canada.
You fall into one of the other exemption categories as specified by the Public Health Agency of Canada

유학생이면서 캐나다로 돌아오지 못하고 있는 학생들에게는 온라인으로 수업을 하고 있는 것으로 알고 있다.

그러니까 현재 캐나다 밖의 다른 나라에서 온라인으로 공부하고 있는 학생들은 캐나다로 언제든지 돌아올수 있게 되었던건데 작년 늦가을 이후부터는 이전에 받았던 비자 승인 레터는 효력이 없고 다시 신청하여 받아야 한다고 들었다.