Sondee ran a personal best and Thai national record of 6.65 seconds at the 2006 Asian Indoor Athletics Championships, but was edged into second place as China's Gong Wei took the 60 m gold. This performance earned him selection for the 2006 IAAF World Indoor Championships in Moscow the following month, but he was eliminated in the first round. The 2006 Asian Games that year saw him run a 100 m personal best of 10.39 sec in the final to secure the bronze medal. Sondee and a team including Sittichai Suwonprateep saw off Japan to win the 4×100 m relay gold medals.