On 12 January 2009, after a three-year contract with the Urawa Red Diamonds had come to an end, Soma decided to forgo contract extension talks to pursue a career overseas in Europe. On 29 January 2009 Soma signed with Marítimo of the Portuguese Liga, on a one-and-a-half year contract. At the end of this contract, he left Portugal and signed with German second division club Energie Cottbus.