On 2 May 2017, Goriss was appointed an assistant coach of the Australian women's national basketball team (the Opals), working under the Opals' head coach Sandy Brondello, and alongside the Sydney University Flames' coach Cheryl Chambers, who was also named as an assistant coach. In the Opals' run up to the 2020 Tokyo Olympic Games, their immediate challenge was the 2017 FIBA Women's Asia Cup in Bangalore, India, in July 2017, where Australia needed a fourth-place finish in order to qualify for the FIBA Women's Basketball World Cup; they finished second, losing to Japan in the final. At the 2018 FIBA Women's Basketball World Cup in Tenerife, Spain, the Opals won silver, this time losing out to the United States in the final on 30 September 2018.