It is important to understand that the Minnesota Institute for Sustainable Agriculture (MISA) is one small organization within the University of Minnesota. MISA staff are involved in the Sustainable Agricultural Systems degree programs, but the courses and the degrees are offered through the University of Minnesota.
You would need to apply to become a student at the University of Minnesota, and then choose Sustainable Agricultural Systems as your minor degree program. Here is the link for finding more information about admission to the University of Minnesota:
Here are some more University of Minnesota resources that could help to answer questions about scholarships and jobs for international students:
International Student and Scholar Services: http://www.isss.umn.edu/
There is more information for international students at http://passport.umn.edu