Born in Blenheim, Sigmund spent his early career with Football Kingz, Canterbury United, Fawkner Blues and Auckland City.

On 6 September 2008 Sigmund scored his first international goal in a 3–1 win over New Caledonia with a header from a corner.

[8] Sigmund was named as part of the 2009 FIFA Confederations Cup New Zealand squad to travel to South Africa,[9][10] and was more recently in the side the beat Bahrain in the 2010 FIFA World Cup qualification match on 14 November 2009.

On 10 May 2010, Sigmund was named in New Zealand's final 23-man squad to compete at the 2010 FIFA World Cup.

[11] On 29 September 2014, Sigmund retired from international football citing his desire to spend more time with his family.