31-year-old penned a deal with the Oly Dade lads after successful negotiations.
He has been without a club since parting ways with Hearts of Oak after he was deemed surplus to requirement by the club.
Sowah was linked with a move to Nigerian Professional Football League side Heartland FC last year, however, the deal fell through at last hour.
He has previously played for Berekum Chelsea, whom he helped during the 2012 CAF Champions League Group stage as well as DR Congo side Don Bosco.
He has also featured for the two most successful clubs in Ghana i.e Asante Kotoko and Hearts of Oak