Sakai was born in Chiba Prefecture on January 10, 1989. After graduating from Keimei Gakuin High School, she joined Tasaki Perule FC in 2007. However, the club was disbanded in 2008 due to financial strain. So, she moved to INAC Kobe Leonessa in 2009. In 2012, she moved to new club Vegalta Sendai (later "Mynavi Vegalta Sendai"). She played 143 matches for the club in 9 seasons. In 2021, she moved to new club Omiya Ardija Ventus.