Mergen Sandanov was born in Ulzyte (Eravninsky Region, the Republic of Buryatia). In 2006, he graduated from the P.I. Tchaikovsky Music College (class of the Honoured Artist of Russia, Honoured Artist of the Republic of Buryatia, V. Elbayev). In 2012, graduated from M.I. Glinka Novosibirsk State Conservatory (class of D.Z. Shagdar). In 2011 he became a soloist of the Tsydynzhapov Buryat State Opera and Ballet Theatre. Since 2018, he has been a soloist of the Opera Company of the Primorsky Stage of the Mariinsky Theatre.
Repertoire at the Primorsky Stage of the Mariinsky Theatre includes:
Cavaradossi (Tosca, G. Puccini);
Don Jose (Carmen, G. Bizet);
Alfredo (La traviata, G. Verdi);
Radames (Aida, G. Verdi).
Repertoire also includes: Vakula (Christmas Eve, N. Rimsky-Korsakov), Vladimir Igorevich (Prince Igor, A. Borodin), Calaf (Turandot, G. Puccini), Richard (Un Ballo in Maschera, G. Verdi), Young Gypsy (Aleko, S. Rachmaninoff), Darkhan (Enhe-Bulat Bator, V. Frolov).