The European route E18 highway and the Vestfoldbanen railway line both passed through the municipality.

[6] The parish of Sandeherred (later spelled Sandar) was established as a municipality on 1 January 1838 (see formannskapsdistrikt law).

On 1 January 1889, an area of Sandeherred (population: 318) was annexed and became part of the town of Sandefjord.

[7] During its existence, Sandar was basically the rural area surrounding an urban town.

Many famous corporations now associated with Sandefjord had their origins in Sandar including Jotun, Framnæs Mekaniske Værksted and Sandar Fabrikker (a chemical plant dedicated to refining whale oil).

On 3 November 1917, a royal resolution changed the spelling of the name of the municipality to Sandeherad.