Simon Busk Poulsen (born 7 October 1984) is a retired Danish professional footballer who played as a left-back. He has played 31 games for the Denmark national football team. He is currently the assistant coach of SønderjyskE.
Poulsen started his senior career in 2002 for HFK Sønderjylland in the Danish 1st Division, the second tier of professional football in Denmark. He played four seasons at HFK Sønderjylland. The club changed its name to SønderjyskE in 2003, and Poulsen helped it win promotion to the Danish Superliga in 2005.
In June 2005, he agreed to move to league rivals FC Midtjylland (FCM) in the summer 2006, at the end of the 2005–06 Superliga season. SønderjyskE complained about the tapping-up of Poulsen to the Danish Football Association, but agreed to let Poulsen go in August 2005. Having played five Superliga games for SønderjyskE, Poulsen went to FCM, with Thomas Rathe switching from FCM to SønderjyskE as a replacement. He established himself in the FCM team, and only missed one Superliga game in his first six months at the club. He suffered an injury in February 2006, and returned to the team in May 2006. In the first half of the Danish Superliga 2007-08 season, he scored 3 goals in 18 games, and was included as left winger in the 2007 Danish Team of the Year.