[2] He moved to Australia and began playing for the Sydney Kings of the National Basketball League (NBL) as a development player in 2020, appearing in eight games that season while scoring two points.
[7] Galloway was part of the full roster for the Kings in the 2022–23 season and helped them repeat as league champions, averaging 5.1 points and 1.8 rebounds per game.
[2][8] After the season, he played for the Ipswich Force along with his brother in NBL1 North, averaging 18.1 points and 5.4 rebounds per game while helping the team win their first league championship, over the Gold Coast Rollers.
[11] On March 3, 2024, after the Kings' season ended, Galloway signed a two-way contract with the Milwaukee Bucks of the National Basketball Association (NBA).
[20] He made his senior debut for Australian national team in February 2022 during a FIBA Asia Cup qualifying game against Taiwan.