Thomas takes on the role of defence and skills coach as part of the Rugby World Cup Coaching Internship Programme, which is supported part of the International Olympic Committee's international development grant to World Rugby.
The former Wallaroo playmaker will join newly-appointed head coach Senirusi Seruvakula and the wider management team as the Fijiana prepare to compete in their first-ever Rugby World Cup.
"I am extremely excited to be appointed as an assistant coach of the Fijiana 15s team and take part in the World Rugby Coaching Internship Programme, Thomas said.
