If you’re from the EU/EEA, your license is valid in Sweden, but you can exchange it for a Swedish one if you want (if you're a resident in Sweden). Non-EU residents typically have a year to swap their foreign license for a Swedish one, after which you'll need to pass a driving test. The process involves a vision test, paying a fee, and possibly taking a written theory exam if your original license isn't from an approved country. Contact Transportstyrelsen (the Swedish Transport Agency) to read more about specifics.