Sigmund made his senior international debut as a substitute in August 2000 against Oman, but did not earn a second cap until 2007, where he earned a call up to play Wales in Wrexham after nearly seven years in the football wilderness.
On 6 September 2008 Sigmund scored his first international goal in a 3–1 win over New Caledonia with a header from a corner.
Sigmund was named as part of the 2009 FIFA Confederations Cup New Zealand squad to travel to South Africa, and was more recently in the side the beat Bahrain in the 2010 FIFA World Cup qualification match on 14 November 2009.
Former All Whites defender Ben Sigmund believes the current side can win a game at next year's World Cup... Sigmund was a member of that side in 2010 that drew all of their group games ... However, Sigmund believed this side could win a game in the finals.