On 28 October 2004 Wenta was announced as Poland men's national handball team head coach. In 2007 he achieved with national team the biggest success of Polish handball - Poland won silver medal of World Championship. They lost the final to host team - Germany 25:29. In 2008 Poland took the fifth place by defeating Russia 29:28 at 2008 Summer Olympics, held in Beijing. In 2009 Poland led by him achieved second medal of IHF World Handball Championship. They won the bronze medal by defeating Denmark 31:23 at World Championship 2009 in Croatia. In January 2010 he was awarded "Coach of Year 2009" by Plebiscite of Przegląd Sportowy. In 2012 national team did not qualify to Olympic Games. On April 19, 2012 he announced his resignation.