Lewandowski was head coach of VfL Bochum II between 1 July 2006 to 31 December 2006.

Lewandowski was appointed as head coach of Bayer Leverkusen in April 2012 alongside Sami Hyypiä.

[1] After the 2012–13 season, Lewandowski went back to the youth set–up, leaving Hyypia as the sole head coach of the first team.

[7] He stepped down on 4 March 2016, after six months in charge,[8] on medical advice because of acute fatigue symptoms.

In the days before this event, he had been held by the Dortmund police for charges of child abuse.