Sainz graduated with a licenciatura en derecho ("bachelor in law") degree from the Universidad del Valle de Mexico in Querétaro and a masters in tax law from the Universidad Autónoma de Querétaro. Her father was likewise a lawyer. Additionally, Sainz obtained a graduate degree in sports business administration. Moving from modeling to television sports reporting, Sainz married Mexican television producer Héctor Pérez Rojano and they have four children, María Inés, Eduardo, Hector, and Maya. Sainz remained an active participant herself in such sports as football, swimming, volleyball, basketball and tennis.