Sondee made his first international appearances in 2005, starting with a sixth place finish in the 100 metres final of the 2005 Summer Universiade and a run at the 2005 Asian Athletics Championships. That November, he ran in the 60 metres final of the inaugural Asian Indoor Games in Bangkok, but was beaten to the gold by Yik Chun Tang and had to settle for second place. He won the gold medal in a Thai 1–2 of the 100 m at the 2005 Southeast Asian Games with Sompote Suwannarangsri, and the pair teamed up to claim the 4×100 metres relay title. 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. Bangkok hosted the 2007 Summer Universiade and although Sondee was knocked out of the 100 m at the semi-final stage, his Thai team including Pirom Autas, Suwannarangsri and Suwonprateep won Thailand's first ever medal in the history of the competition by taking the 4×100 m relay gold. In October he equalled his 60 m best at the 2007 Asian Indoor Games, taking the bronze. He attempted to defend his 100 m title at the 2007 Southeast Asian Games, but his personal best run of 10.33 sec was only enough for second behind Indonesia's Suryo Agung Wibowo. The relay team was unrivalled, however, as Sondee led off the team to a Games record mark of 38.95 seconds. He missed much of the 2008 season but returned to international competition at the 2009 Summer Universiade, where he was fourth with the Thai men's relay team. He was chosen for the relay team at the 2009 World Championships in Athletics, but they did not make it into the final round. At the 2009 Asian Indoor Games he repeated his 2007 performance by taking the 60 m bronze medal. A 10.30-second run at the 2009 SEA Games brought him a second consecutive silver medal and he also won a gold at the competition for the 4×100 m relay. Sondee reached the 100 m semi-finals at the 2010 Asian Games, but the Thai men failed to defend their relay title, leaving the competition with the bronze medals on this occasion.
