[4] He has also played for YMCA Coastal City Hockey Club in the Western Australia Premier Competition.

[9] Joshua Simmonds made his junior international debut for the Australia U–21 side in 2015, at the Sultan of Johor Cup, where the team finished fifth.

[11] Following two years in the national development squad, Simmonds made his senior international debut for the Kookaburras in 2018 during a test match against Argentina in Darwin, Northern Territory.

[14] Simmonds continued to represent the team during the Pro League, culminating with a gold medal in Amstelveen, following a 3–2 win over Belgium.

The team reached the final for the first time since 2004 but couldn't achieve gold, beaten by Belgium in a shootout.