In 2008 Soumahoro moved to [[Thai Premier League]] side [[Muangthong United F.C.|Muangthong United]] from SéwéSéwé Sports. He became a figurehead in this team, as he scored many goals and charmed the supporters with his numerous dribbles. He scored 32 goals in 72 games and helped the club win the Thai Premier League Championship [[Thai Division 1 League]] in [[Thailand Division 1 League 2008|2008]] and the [[Thai Premier League]] in [[2009 Thai Premier League|2009]].{{Citationcite needednews|publisher=[[Daily Post]]|title=เมืองทองเปิดตัว"ยาย่า"บู๊เลกสอง|url=https://www.posttoday.com/lifestyle/438729|language=th|date=April21 June 20192016}}
