CICのページ:
http://www.cic.gc.ca/english/information/faq/immigrate/sponsor/spouse-faq12.asp
↑
ここに"•you can leave and re-enter Canada while your application is being processed
as long as you meet all requirements to enter Canada"
とあり、『国外申請』で申請すれば出入国が可能なのだと理解してました。