[5] After making his début in Jersey Flegg, Soliola moved onto Premier League in which he played with Eli Hayes and won a premiership with the Roosters in 2004.

He was chosen to make his international début at the age of 19 for New Zealand in the Tri-nations series of 2005, however was forced to pull out due to injury.

Soliola returned from his lengthy spell on the sidelines in the off season to come off the bench in the Roosters' opening centenary clash against South Sydney in round 1.

[9] The Sydney Roosters confirmed that Soliola had signed a three-year deal to play with English Super League club St. Helens midway through the 2009 NRL Season.

Iosia Soliola was selected for the Exiles squad for the inaugural Rugby League International Origin Match against England.

On 12 April 2014, Iosia announced he would end his Super League career at the conclusion of the 2014 season.,[12][13] He agreed join the Canberra Raiders in 2015 on a two-year deal.

[14] St Helens reached the 2014 Super League Grand Final, and Soliola was selected to play at second-row forward, scoring a try in their 14-6 victory over the Wigan Warriors at Old Trafford.

[23] Soliola made 26 appearances for Canberra in the 2019 NRL season as the club reached the grand final for the first time in 25 years.

[24][25][26] After playing the first eight games of the 2020 NRL season for the Raiders, Soliola suffered a horrific facial fracture during their 22-16 win against St. George Illawarra on 3 July.