 The municipality consists of the town Sebnitz itself, Schönbach (joined 1935), Hainersdorf (joined 1920), Hertigswalde (joined 1950), Hinterhermsdorf (joined 1998) and the former municipality of Kirnitzschtal (joined 2012), that itself consisted of the villages Altendorf, Mittelndorf, Lichtenhain, Ottendorf and Saupsdorf.Sebnitz was first mentioned in a document of 1223/1241 outlining the borders between the kingdom of Bohemia and the diocese of Meißen.In 1451 it was first mentioned as a town.