The 25 under-17s and 25 under-15s were chosen for the state team after the regional competition at the end of last year.
Poi has previously played in the South Regional under-14s and under-16s, and played in the Palmyra Rugby Club’s winning under-17 gold premiership squad.
The loose forward started playing rugby in 2006 for the Ponsonby rugby club in Auckland when he was eight.
‘I love the game and I had a dream and passion, like most kids, to play rugby at an international level,’ he said.
He still hopes to play representative rugby at a higher level and is looking forward to representing WA and competing against teams from across Australia for the Cup.
In 2014, WA were the champions of the under-17 division after defeating Victoria 28-19, and the under-15 team finished third in its pool.
The WA players this year are part of the D pool, made up of WA and Queensland, and will fly in on Sunday, March 8.
On March 9, 11 and 12, they will play the central Queensland, Gold Coast and Logan teams before travelling to Brisbane to play North Coast and Brisbane on March 14 and 15.
The winners of pools C and D will play each other, as will the winners of pools A and B which are made up of the South Australia and New South Wales.
The winners of those matches will go through to the grand final.