In 1948, the municipal name was changed to Sandnessjøen, after the main town in the municipality. The town was named after the old Sandnes farm () since the town grew up on the grounds of the old farm.
The text describes how the municipality's name changed from a previous one to Sandnessjøen in 1948. This change is explained by the fact that the town was named after the historic Sandnes farm, which served as the foundation for the town's development.