Here are the websites of the places I have found:
http://www.onthetrail.ca/dogtracking.php
http://www.hightails.ca/dog-training...-descriptions/
http://www.theplace4paws.com/training/
http://clevercanine.ca/class/find-it-nosework-classes
The place 4 paws is where I'm currently taking my dog for puppy manner classes, but she also offers some additional nose work courses once you've completed the basic training. I haven't personally went to classes at Clever Canine, but I have a friend who took her rescue Shepherd through a course with them who had some severe issues and she turned into the best/well behaved dog. I've heard a lot of great things about the company itself so I thought I would add it here. They offer probably the best option if you want to train your dog to hunt for sport. The other two were just something I found on the web, and I can't personally say if they would be worth it, but I thought I would add them on here. Hopefully that helps!