Okul played for the Lae club in Papua New Guinea and represented the Highlands Zone in 1991 against Australia.
[1] He was first selected for Papua New Guinea in 1994 and played in another three test matches, including two at the 1995 World Cup.
Following the tournament he was signed by Hull Kingston Rovers, along with teammate Stanley Gene.
After his Hull KR career was hampered by injury, Okul had stints with the Doncaster Dragons, and the Barrow Border Raiders.
In 2002 and 2003 he played for West Hull in the BARLA National Conference League’s Premier Division.