She earned her quota at the women's 10 meters air rifle final in the International Shooting Sport Federation (ISSF) Rifle and Pistol World Cup in Rio de Janeiro.
Sadeghian registered 628.3 points and qualified for the final.
In April, Iranian shooter Najmeh Khedmati earned a quota place for the Tokyo 2020.
She came fifth at the women's 10 meters air rifle in the 2019 ISSF World Cup Rifle and Pistol in Beijing, China.