Munster Coughlan made his Munster debut against
Cardiff Blues in the
Celtic League in September 2006, and his performances in his first season earned him a full contract. He made one appearance for Munster during their victorious
2007–08 Heineken Cup campaign. Coughlan was one of the stars for Munster in their 18–16 defeat by
New Zealand at the opening of
Thomond Park in November 2008.
Denis Leamy's injuries propelled Coughlan into the Munster starting XV in the 2009–10 season, and he become a mainstay in the team, captaining Munster during their historic 15–6 win over
Australia in November 2010, and winning the Munster Player of the Year award for 2011, beating fellow nominees
Keith Earls,
Ronan O'Gara and
Doug Howlett. He started at number 8 for Munster as they beat old rivals
Leinster 19–9 to win the
2011 Magners League Grand Final. Coughlan was ruled out of the remainder of the 2011–12 season after a fractured bone in his hand, sustained in Munster's Heineken Cup quarter-final defeat against
Ulster on 8 April 2012, required surgery. Coughlan agreed a contract extension with Munster in January 2013. Coughlan scored a try and won the
player of the match award in Munster's 38–6 win against
Edinburgh in round 6 of the
2013–14 Heineken Cup on 19 January 2014, a win that secured a home quarter-final for Munster. Coughlan was nominated for the Munster Rugby Senior Player of the Year 2014 award, and won the
IRUPA Unsung Hero award during the annual awards in May 2014. Coughlan left Munster in June 2014, after being granted an early release from his contract to move abroad.
Pau Coughlan joined French
Pro D2 side
Pau on a two-year contract at the beginning of the 2014–15 season. Coughlan announced that he was retiring from rugby union upon the conclusion of the 2016–17 season, bringing to an end his 11-year professional career in which he won 139 caps for Munster, 69 for Pau and 1 for
Ireland Wolfhounds. ==Ireland==