Sapowicz initially trained in gymnastics before beginning a career in football. She began her career playing for nearby club Association Sportive Bretolienne. She spent 12 years at the club before joining the women's section of city club Évreux AC. While at Évreux, she became a youth international and eventually was selected to attend CNFE Clairefontaine, the women's section of the Clairefontaine academy.
Paris Saint-Germain
In 2002, she joined Paris Saint-Germain and after a year in the youth system joined the club's senior team. In her first season with the club, she appeared in 17 matches. The following season, her playing time decreased making only ten appearances in the league, which included scoring a goal. In the next two seasons, she appeared in 27 matches. Her 2007–08 season was uneventful as she missed the entire year due to tearing her ACL in one of her knees. She returned to form for the 2008–09 season appearing in 20 matches as Les Parisiens finished the season mid-table. The 2009–10 season saw the arrival of fellow internationals Camille Abily, Sonia Bompastor, and Élise Bussaglia. The arrival of the veterans paid extreme dividends to the club and Sapowicz as the goalkeeper failed to concede a goal until the 10th league match of the season. Sapowicz finished the season appearing in 25 total matches. She was the starting goalkeeper for Paris Saint-Germain in its 5–0 win over Montpellier in the 2010 Challenge de France Final. Sapowicz remained the first-choice goalkeeper for the 2010–11 season. The goalkeeper appeared in 20 league matches as Paris Saint-Germain qualified for the 2011–12 edition of the UEFA Women's Champions League after finishing runner-up to champions Lyon.
International career
Sapowicz had previously starred with the women's under-17, under-19, under-20, and under-21 teams. In 2002, she was designated as the starting goalkeeper for the under-19 team at the 2002 FIFA U-19 Women's World Championship, held in Canada. She appeared in all three group stage matches as France suffered group stage elimination. The following year, on 14 September 2003, Sapowicz was selected to the France squad to play in the 2003 FIFA Women's World Cup, despite not having any senior international experience. She was installed as the backup goalkeeper, but did not make any appearances as France suffered elimination in the group stage. On 14 September 2003, she made her senior international debut in a friendly match against Japan. Due to an injury to France number one Sarah Bouhaddi, national team coach Bruno Bini gave Sapowicz the starting goalkeeper position for France's qualifying campaign for the 2011 FIFA Women's World Cup and the competition itself.
