Striker Sweetman-Kirk joined the Reds from Everton in 2018 and ended her first season with 13 goals.
LFC Women manager Vicky Jepson said: “I’d like to thank Courtney for her last two years at the club.
“Myself and all the backroom staff would like to wish her the very best of luck with the challenges ahead.”
Everyone at Liverpool FC Women would like to thank Courtney for her contribution and wish her every success in her future career.