Sebastian Boenisch is a Polish footballer who plays for Bayer 04 Leverkusen and the Polish national team, mainly as a left back.

Boenisch made his professional debut for Schalke 04 on 11 February 2006. He was substituted on in the 86th minute, in a 7–4 home win against Bayer 04 Leverkusen. His only other appearance that season was in a 2–1 win against RCD Espanyol in the UEFA Cup. On 1 September 2007, he moved to Werder Bremen.

As of the end of the 2011–12 season, Boenisch is a free agent having let his contract run down and played that poorly during the UEFA Euro 2012 that VfB Stuttgart withdrew their contract offer, citing lack of performance as the reason for their action.

On 6 August 2012, Boenisch was handed a trial at English Premier League side Stoke City and started a pre-season friendly for the club against Torquay United and Yeovil Town. However his trial was unsuccessful and he was not offered a contract by Stoke.

On 4 November 2012, Boenisch joined Bayer 04 Leverkusen.