His managerial career began with FC Emmenbrücke where he was player manager from 1995 to 1997. After this he spent a season with each,
FC Winterthur and
FC Baden. In March 1999 he took on German second division side
SSV Ulm 1846, then on 5th place and in the course of the season's last 11 matchdays led them to the third place, and thus the first ever promotion to the
Bundesliga. After 24 matches there the club was closer to an
UEFA Cup rank then to the relegation zone, but a crisis thereafter saw the SSV 1846 passed down again after just a single season. After bad results at the beginning of the new year in the second division Andermatt was let go already in September. This maneuver did not help the club at all and by the end of that season Ulm had gone all the way to the third division. From June 2001 until his premature exit in March 2002 he was hired by German side
Eintracht Frankfurt which was just relegated to the second division in the hope that he might lead the team to an immediate return to the Bundesliga. After the fulfillment of this aspiration became more and more unrealistic he was replaced halfway through the second half of the season. After this he returned to Switzerland and took over the reins at first division side
FC Wil where he was fired in 2003 after the brief and turbulent take-over by former
European Footballer of the Year winner
Igor Belanov. in
Vaduz, Liechtenstein (capacity of 6 127) From 2003 to 2005 he coached
FC Vaduz in
Liechtenstein and alongside this the
national side of the principality, where he could achieve some surprising results when drawing. 2-2 against Portugal, the losing finalists of the
Euro 2004. Before this result, Liechtenstein had lost all of its previous 20 World Cup qualifiers. The team also caused a shock in the return match at the end of the group phase when Benjamin Fischer scored and Liechtenstein led at half time before eventually losing 2-1. Liechtenstein under andermatt also won 4-0 at
Luxembourg. On the other hand, Liechtenstein are the only country ever to lose to
San Marino with a 0-1 loss in a friendly match on 28 April 2004. The club side led in the
Swiss second division for a long stretch of the 2004/05 season. At the end of the season FC Vaduz had a minor crisis which saw the slipping and Andermatt was fired four rounds before the end of the season. Vaduz missed out on promotion in the play-off matches versus
Neuchâtel Xamax. Andermatt however retained his position with the national team until October 2006 when he took the manager job with
BSC Young Boys in
Bern. There he finished his first season 4th. On 17 September 2021, he was hired by
Schaffhausen in the
Swiss Challenge League. The club hired
Artim Šakiri as a new manager just two weeks prior, but Šakiri was not able to obtain a work permit quickly, and the club hired Andermatt instead. Despite leading Schaffhausen to a second-place finish in the
2021-22 Swiss Challenge League (sadly, missing out on promotion in the promotion playoff), his contract was not renewed for the following season. On 10 June 2022, Andermatt was hired as an assistant coach by
Basel. On 9 March 2026, he returned to coaching, taking the head coach position at
Swiss Challenge League side
Yverdon-Sport. ==Personal life==