Soakai closed out his career with the Tokyo-based Kubota Spears in 2015-16 season as a player-coach. Following his retirement, Soakai transition into full time coaching. 2022 Soakai went onto coach the Japan National Development Squad which successfully beat Uruguay in a test match.
After spending the 2004 season on loan with Southland, Soakai made his debut for Otago in 2005 and by the 2006 Air New Zealand Cup was a regular starter for the squad. In ensuing seasons, he developed into one of Otago's most reliable players, and was selected team captain for the 2009 Air New Zealand Cup.
In the 2010 ITM Cup, Soakai made his 50th appearance for Otago and set a personal best with 3 tries over the course of the season, but endured a difficult season as captain as the team had a disastrous year to finish dead last in the competition.
He played over fifty games in club rugby for Kaikorai Demons in the local Dunedin competition.
Super Rugby
Soakai was selected to the Highlanders squad for the 2007 Super 14 season, and appeared in all but one game for the team including 7 starts. After a mass exodus from the club following the 2007 Rugby World Cup, Soakai solidified his spot as the team's starting openside flanker in 2008.
Soakai continued to be a fixture for the Highlanders through the 2009 and 2010 Super 14 seasons, starting 12 out of the 13 matches in both years.
Following the 2011 season, Soakai left New Zealand to sign in Japan with the Kubota Spears.
A strong 2009 Super Rugby season, Soakai was selected to the Junior All Blacks for the 2009 IRB Pacific Nations Cup. He appeared in all 4 games in the tournament, including a start against Japan, as the squad swept their way to victory.
2010, Soakai earn the opportunity to captain the New Zealand Barbarians against the New Zealand Maori, marking 100 years of Maori Rugby.
"Highlanders Profile". Archived from the original on 26 May 2010. Retrieved 7 October 2018.{{cite web}}: CS1 maint: bot: original URL status unknown (link)