Voll, 20, is one of the most highly regarded batting talents in the Australian game and has also had an impact with her offspin.

Voll had interest from a number of WBBL clubs but said conversations with Thunder coach Lisa Keightley had swayed her decision.

"I never expected myself to play for a New South Wales team, to be honest, but after talking to Lisa and the guys down there, I'm super excited for the opportunity, and it's a really good young group coming through," she said.

"Lisa was quite clear on the role she wants me to play and what she wants me to do and that sort of got me over the line. I liked what the Thunder were about last year, really playing as a team and getting around each other on and off the field."

Trent Copeland, Sydney Thunder general manager, added: "Georgia has shown since the day she arrived on the scene that she is a special talent with both bat and ball If you were to pinpoint the next young star to crack the Australian setup, Georgia is it. The 200 for Australia A in red ball cricket, two 100's in WNCL last season and the all-round capabilities we've seen for the Heat in WBBL. This is a huge signing for the club."

Voll's departure continues significant change at Heat during the off-season with them also losing New Zealand allrounder Amelia Kerr to Sydney Sixers while coach Ashley Noffke has departed for a job in New Zealand. However, they have signed South Africa allrounder Nadine de Klerk on a two-year deal and will still have a formidable top order that includes Grace Harris, Georgia Redmayne, Laura Harris and emerging allrounder Charli Knott.