To enter Sweden you need to apply for a visa.
France represent Sweden in Laos. If you live in Laos and wish to apply for a Schengen visa to visit Sweden for less than 90 days, apply through the French Embassy in Vientiane. More information on how to apply is found on the webpage of the French Embassy.
If you intend to visit Sweden for longer than 90 days, read more information about Visitor's Permits.