Unfortunetly that is the path 007 has taken. Aquiring airsoft in Canada these days is no easy feat if your attempting to do it on your own. However you are in luck, this website has a classifieds buy and sell area and I believe there maybe a Thompson or two in there for sale at this time. I believe there maybe an ASC retailer that sells a Thompson by another company as well. All that you require to access this websites classifieds is to go through the age verifacation process. Once this is complete you will be granted acess to this websites buy and sell section and you will also learn of the Canadian retailers who legally bring in airsoft.
For more information in regards to getting age verified, please see here:
http://www.airsoftcanada.com/showthread.php?t=49408
For a list of verifiers in your area, please see here:
http://www.airsoftcanada.com/showthread.php?t=23609