Until the Protestant Reformation of 1528, Sornetan was part of the parish of Sapran. After it adopted the new Reformed faith, it joined the Tavannes-Chaindon parish, but only remained until 1538. It then joined the Grandval parish and remained in that parish until 1571, when it joined Bévilard. Sornetan remained part of that parish for almost two centuries, but in 1746 it became an independent parish. The parish church was built in 1708-09 and today is a Swiss heritage site of national significance. It was renovated in 1964-67.