Early career 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. He won two of his 14 matches as head coach. Vollmann was head coach of
SG Wattenscheid 09 from 11 April 1996 to 30 June 1996. His first match was a 1–0 loss to
Arminia Bielefeld. He won four of his 11 matches. His first match was a 1–0 win against
SV Elversberg. They finished the season in fifth place. In the next season, they lost 3–2 against the reserve team of
1. FC Kaiserslautern. The team finished eighth in the league. Vollmann was head coach of
Eintracht Trier from 1 July 1998 to 6 October 1999. His first match was a 3–0 win against
Rot-Weiß Oberhausen. He departed from the club on 6 October 1999, The club won six out of 12 matches. His first match was a 1–1 loss to
SC Verl. He won nine of his 19 matches. His first match was a 2–2 draw against
Borussia Dortmund II. They finished the season in fourth place and was knocked out of the German Cup in the first round by
Bayer Leverkusen.
Eintracht Braunschweig Vollmann was hired by
Eintracht Braunschweig on 31 May 2001. His term started on 1 July 2001. His first match was a 4–0 win against the reserve team of Bayer Leverkusen. In the 2001–02 season, Eintracht Braunschweig finished in second place and was promoted to the
2. Bundesliga. In the
2002–03 season, Eintracht started with a 4–2 win against
Waldhof Mannheim. This was followed by a 2–0 loss to
Rot-Weiß Oberhausen. He had lost to
Karlsruher SC 2–1 earlier in the day.
Return to Preußen Münster 2002–03 season Vollmann returned to Preußen Münster on 19 December 2002. His first match in his return was a 3–0 loss to
Rot-Weiss Essen on matchday 21, on 1 March 2003.
2003–04 season Vollmann was sacked on 10 November 2003, two days after losing to
Eintracht Braunschweig. 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.
Holstein Kiel Vollmann was named head coach of
Holstein Kiel on 26 February 2004 and was in that position until 30 June 2004 He was head coach for 15 matches; winning five.
Return to Holstein Kiel 2006–07 season He returned to Holstein Kiel as Sporting Director in the 2006–07 season. On 26 February 2007, he sacked
Stefan Böger and appointed himself as head coach. At the end of the season, Holsten Kiel were tied with
Union Berlin,
Rot Weiss Ahlen, and
Borussia Dortmund II with 48 points. However, Holsten Kiel lost the tiebreaker scenario and were relegated to the Oberliga. Holstein Kiel started the 2007–08 season with a 5–0 loss to
Hamburger SV in the German Cup on 5 August 2007. The season included an 8–0 win against
VSK Osterholz-Scharmbeck and two nine–match undefeated streak from 10 August 2007 to 5 October 2007 and from 19 October 2007 to 2 March 2008. They were promoted after winning North division of the Oberliga.
2008–09 season Falko Götz and
Andreas Thom replaced Vollmann on 31 December 2008.
Hansa Rostock Hansa Rostock hired Vollmann on 31 May 2010. His first match was a 3–0 win against
VfR Aalen, on matchday one, on 24 July 2010. After this, Hansa Rostock went on a four–match undefeated streak. Vollmann was sacked on 6 December 2011, three days after losing 3–0 to
Greuther Fürth. Hansa Rostock was on a six–match winless streak at the time of the sacking. His first match was a 4–0 win against
SV Sandhausen on 18 February 2012. He started his tenure with a five–match winless streak (two draws and three losses). The club finished the
2011–12 season in 16th place. In the
2012–13 season, the club got to the
Hesse Cup final where they lost to
SV Darmstadt 98 4–0. They also finished in seventh place in the league. He was sacked on 21 October 2013, two days after losing 2–0 to
SpVgg Unterhaching. They were on a five–match winless streak at the time of the sacking. His first match in his return was a 4–3 win against
Preußen Münster on matchday one, He was sacked on 7 December 2014.
VfR Aalen He was appointed as the head coach of
VfR Aalen on 12 June 2015. He made his debut on 25 July 2015 against
Chemnitzer FC. The match finished in a 0–0 draw. ==Managerial record==