Sjömarken is a locality situated in Borås Municipality, Västra Götaland County, Sweden.

[1] Here you can find a pizzeria, a kiosk, an antique store, a boat store, a squash hall, and a very active sports club, with football (soccer) and table tennis as main sports, a number of companies and a beach, "Sjömarkensbadet".

Sjömarken is situated at the Lake Viared, which is about 200–600 meters wide and about 6 kilometers long.

Along the lake is a number of beaches in Sjömarken, Lyckebo, Viareds Sommarstad, Sandared and Hultafors.

Sjömarkens' missionary church is located in the center of the town, and also has a squash hall that can be rented.