http://www.migrationsverket.se/English/Private-individuals/W...
"Requirements for obtaining a residence permit as a self-employed
In order to obtain a residence permit, you must:
- have a valid passport
- show that you have significant experience in your field and previous experience of running your own business
- have documented knowledge in Swedish and/or English
- show that you are running the business, that you have the ultimate responsibility for it and that you own at least half of the business
- show that the business' services or goods are sold and/or produced in Sweden
- show that you have sufficient funds to support you and, if applicable, your family during the first two years (equivalent to SEK 200,000 for you, SEK 100,000 for your spouse and SEK 50,000 for each accompanying child)
- show that the business, following the two-year probationary period, is expected to be able to support yourself and, if applicable, your family.
The Swedish Migration Board will assess your business plans from a financial perspective."