Seabra, 48, has penned a two-year deal with the Iran handball federation.
She has represented his national team 215 times and as a player has played in the Spanish side Club Balonmano Atlético Guardés and AA Sao Pedro do Sul in her homeland.
She will lead Team Melli in the 2025 World Women's Handball Championship, where the Iranian women are drawn in Group B along with Hungary, Switzerland and Senegal.