University of Hawai'i women's water polo head coach Maureen Cole announced the signing of Sophie Milliken to a national letter of intent for the 2020 season. The Queensland, Australia native will have four years of eligibility. 
 
Milliken last competed for the Queensland Thunder out of Australia's premiere OVO Australian Water Polo League. This past season, she helped guide her team to its first league championship with a 16-5 record. On the season, she appeared in all 21 matches and produced the third-most goals on the team with 24. 
 
She also earned a capped roster spot on the Aussie Stingers team by Water Polo Australia and competed on the Australia squad that finished runner-up at the 2019 FINA World League Intercontinental Cup. In addition, she was a member of Australia's 2018 FINA Youth World Championships squad that placed fourth.
 
Milliken is a 2017 graduate of Mt. Saint Michael's College in Ashgrove, Queensland, Australia.