Moriarty changed
rugby football codes from
rugby union to
rugby league when he transferred to champions
Widnes. He was selected to play on the interchange bench for
Widnes in their
1989 World Club Challenge victory over the
Canberra Raiders. Moriarty also gained caps for the
Great Britain Lions against
Papua New Guinea in 1991 and
France in 1994. He transferred from Widnes to Halifax for the
1994-95 Rugby Football League season, and was included in the
Wales squad for the
1995 Rugby League World Cup, he also played for
South Wales on loan. Moriarty returned to rugby union when the code officially became professional and rejoined Swansea. A few years later following an injury crisis for the Welsh rugby league side's forward pack during the
2000 Rugby League World Cup, 36-year-old Moriarty was recalled to the side. After coach John Plumtree's departure in November 2001, Moriarty became
player-coach, and, along with
Tony Clement, ensured Swansea qualified for the 2002–03
Heineken Cup despite being fourth from bottom of the
Welsh-Scottish League when they took over. ==Coaching career==