The university is Högskolan på Gotland (
www.hgo.se). I chose them partially because of the teaching staff and partially because of the digsites available. They have courses in English, such as Viking Society, and an iron age dig that's done during the summer, completely in English. Unfortunately, the course I was speaking about above is done in situ and in Swedish, but they may be able to make accomodations. It's a year long, though, so you'd have to get permits etc to attend. If you want to do the Viking Society, wait for me, cuz I am taking it next fall! Programs that the government sponsor, i. e. elementary, middle and highschools, college and university is free of charge, but I thought I'd mention this guy, too:
http://www.arkeodok.com/index1.html
The guy, Dan Carlsson, lectures at my school, but he is also running this program on the side as of this fall. I am very interested in it, and it sounds really good for something along the lines of what you want to do. It's a shorter time span, and it's specifically set up for foreign students. The catch is, that just like schooling in the US and Canada, there will be a fee involved here.
The York (Jorvik) dig will let you work along for up to three weeks as a student. I cannot remember which school sponsors that right this second, but it'll come to me (having a bad week - feel like my brain is made from Swiss cheese right now). There is a fee involved, but THAT dig for sure is worth a fee, on the merits of how nice it'll look on your resume...