In 2013, she replaced Allison McNeill as head coach and her team won silver at the 2013 FIBA Americas Championship for Women. Following her promotion, Thomaidis led Canada's women's basketball team to a fifth-place finish at the 2014 FIBA World Championship for Women and a gold medal at the 2015 Pan American Games. Recently, Thomaidis's team came in seventh at the 2016 Summer Olympics and won a gold medal at the 2017 FIBA Women's AmeriCup.