Sahasinaka is a town in the south-east of the Vatovavy-Fitovinany Region in Madagascar.

It lies at the Faraony River and the Fianarantsoa-Côte Est railway that links the town with Fianarantsoa and Manakara.

Coordinates: 21°48′S 47°50′E / 21.800°S 47.833°E / -21.800; 47.833