Hector Sandoval started his career in his hometown of Mexico-City. Fascinated by the world of theater and opera, he took lessons from 1987 to 1993 at the National Conservatory of Mexico City. His teacher was the well-known professor Enrique Jaso.

Previous engagements in recent years include Gabriele Adorno in Simon Boccanegra in Opèra de Toulon, Pinkerton in Madama Butterfly with which he debuted at The Royal Opera in Copenhagen, his debut as Des Grieux in Manon Lescaut at the Mint of Brussels with Carlo Rizzi, two concerts respectively in Stockholm with Jussi Björling Selskapet and in Finland on Turku Music Festival and also sing don Carlo at Bolshoi Theater in Moscow, Malrico/Il Trovatore at Outdoor Hedeland, Il Tabarro at Finnish National Opera in Helsinki and others.

Sandoval traveled to Europe in 1994, where he studied at the Hochschule für darstellende Kunst in Vienna. He also completed many masterclasses and took the opportunity to present his study repertoire with various famous celebrities such as Placido Domingo, Ileana Cotrubas, Walter Berry, Luigi Alva, Christ Merrit, Ghena Dimitrova, G. Hornik, Toma Popescu, Nico Castel, J. Dornemann, Istvan Serjan and Julius Kalmar. He also worked on his vocal technique with Francisco Araiza.

As a result of positive reviews and several awards, Hector Sandoval became the Singer of it Year in the year 2001 and 2003. In 2001 he also won the international singing competition of Kammeroper Rheinsberg. Hector Sandoval was also successful in musical recordings. In 1998 he won a special prize at Festival Victoria Reggia during a radio and television recording.

Sandoval's engagements have taken him to all major opera houses in Europe, the United States and Latin America, such as Wiener Staatsoper, Semperoper, Washington Opera and Opera Mexico.