Behan has won under age level Munster Youths and Munster Senior Cup medals, and was part of Cork City's run of two consecutive Under 21 League of Ireland. He has been capped for the Republic of Ireland at U16, U17, U18, U21 and U-23 levels. He scored in City's two successful U21 league finals, against Bohemians and St Patrick's Athletic.
Senior career
Cork City
Behan joined Cork City from Brentford. He became a regular first team squad member and was known for his knack of scoring spectacular goals, he is currently the all-time top scorer in the Setanta Cup. Behan came on in the penultimate game of the 2005 LOI season against Derry City, and provided an assist as Cork City won only their second League of Ireland title. In September 2007, Behan recorded his first senior hat trick for Cork City in their FAI Cup quarter-final Replay at home to local rivals Waterford United. He also scored the winner in the 2007 FAI Cup Final when Cork City took on Longford Town.
Hartlepool United
On 16 July 2009, it was confirmed that Cork City had accepted a bid from Hartlepool United to take Behan and fellow Cork City team-mate Colin Healy to Victoria Park. However, only Behan signed as Healy accepted a late offer from Championship side Ipswich Town. On 22 August 2009, he scored his first goal for Hartlepool in a 2–1 loss to Bristol Rovers. He got his second with a sublime free-kick from around 30 yards out in a 3–0 win at Oldham on 5 September, and his third goal for the club ensured a 2–2 draw at Stockport County on 29 September. A fourth followed in the next game, at Exeter City on 3 October, where he opened the scoring after a defensive blunder. Pools went on to lose 3–1, however. In May 2011, he was not offered a new contract by the club, along with nine other players from the 2010–11 squad.
Behan signed for Cork City on 31 January 2013. He had signed for College Corinthians earlier in the week but was released from his contract once Cork City became interested. Behan had his contract cancelled by mutual consent on 30 July 2013.
Personal life
Behan was raised in Abbeyfeale, County Limerick, Republic of Ireland, but was born in Tralee, County Kerry. He managed an under-15 Carrigaline United schoolboy side during his time at Cork City.
