Vollmann was head coach of Rot-Weiß Lüdenscheid between 1 July 1993 to 30 June 1995.

Vollmann was head coach of the reserve team of SG Wattenscheid 09 between 1 July 1995 and 30 October 1995.

[1] Vollmann was head coach of SG Wattenscheid 09 from 11 April 1996 to 30 June 1996.

[3] Vollmann was head coach of Preußen Münster from 1 July 1996 to 30 June 1998.

[8] Vollmann was head coach of Eintracht Trier from 1 July 1998 to 6 October 1999.

[11] Vollmann was head coach of KFC Uerdingen 05 from 1 November 1999 to 30 June 2000.

[13] Vollmann was head coach of Fortuna Köln for 1 July 2000 to 30 June 2001.

[15] They finished the season in fourth place[16] and was knocked out of the German Cup in the first round by Bayer Leverkusen.

[26] Then, on matchday 27, on 19 April 2003, the undefeated streak finished with a 2–0 loss to Erzgebirge Aue.

[26] The team finished with a record of 3 wins, 2 draws, and two losses to close out the 2002–03 season.

[28] Vollmann was sacked on 10 November 2003,[29] two days after losing to Eintracht Braunschweig.

[30] Preußen Münster was in the relegation zone at 17th place with a record of one win, five draws, nine losses, and eight points at the time of the sacking.

[35] On 26 February 2007, he sacked Stefan Böger and appointed himself as head coach.

[36] At the end of the season, Holsten Kiel were tied with Union Berlin, Rot Weiss Ahlen, and Borussia Dortmund II with 48 points.

[38] Holstein Kiel started the 2007–08 season with a 5–0 loss to Hamburger SV in the German Cup on 5 August 2007.

[39] To start the 2008–09 season, Holstein Kiel lost to Hansa Rostock in the German Cup.

[41] Falko Götz and Andreas Thom replaced Vollmann on 31 December 2008.

[47] Vollmann was sacked on 6 December 2011,[48] three days after losing 3–0 to Greuther Fürth.

[53] In the 2012–13 season, the club got to the Hesse Cup final where they lost to SV Darmstadt 98 4–0.