[5] Sang won the 2003 Indonesia Open in the men's doubles with partner Zheng Bo.

In 2004 they defeated Denmark's Jens Eriksen and Martin Lundgaard in the Thomas Cup final to clinch the deciding third point for the Chinese team.

[6] Sang competed for China in badminton at the 2004 Summer Olympics also in men's doubles with Zheng Bo.

They had a bye in the first round and defeated Chan Chong Ming and Chew Choon Eng of Malaysia in the second.

In the quarterfinals, Sang and Zheng lost 7–15, 11–15 to Korea's Kim Dong-moon and Ha Tae-kwon who went on to win the gold medal.