Aled Thomas first joined the Scarlets in 2004, making his first appearance in the Celtic League match against Ulster in Ravenhill.

Following spells playing for Newport Gwent Dragons and London Welsh, He signed for the Scarlets as cover for the 2011 Rugby World Cup .

On 7 March 2009, Thomas was part of the squad that won the 2009 Rugby World Cup Sevens, scoring the winning try in the final against Argentina.

On 24 March 2014, Thomas signed a two-year deal to play for Gloucester Rugby in the Aviva Premiership for the 2014–15 season.

[4] On 17 June 2016, Carmarthen Quins announced that Thomas had been appointed as backs coach.