Soamanonga is a town and commune (Malagasy: kaominina) in southwest Madagascar. It belongs to the district of Betioky Sud, which is a part of Atsimo-Andrefana Region. The population of the commune was estimated to be approximately 9,000 in 2001 commune census.Only primary schooling is available. The majority 60% of the population of the commune are farmers, while an additional 35% receive their livelihood from raising livestock. The most important crops are sugarcane and rice; also cassava is an important agricultural product. Services provide employment for 5% of the population.