Sandborn is a town in Vigo Township, Knox County, Indiana, United States. The population was 415 at the 2010 census. It is the home of the annual Black Creek Festival.
Sandborn was laid out in 1868. It was named for a railroad official. The Sandborn post office was established in 1869.
Sandborn is located at 38°53′46″N 87°11′7″W (38.896191, -87.185150). The town lies in northeastern Knox County, just south of the Knox-Greene county line. Indiana State Road 59 traverses Sandborn, connecting the town with Linton and the Greene-Sullivan State Forest to the north. State Road 67 passes through the northwestern limits of Sandborn, connecting the town with the Vincennes area to the southwest.
According to the 2010 census, Sandborn has a total area of 0.39 square miles (1.01 km2), all land.
As of the census of 2010, there were 415 people, 174 households, and 114 families living in the town.