He completed his studies at the Plzen Conservatory under prof. Jitka Chaloupková and at the Prague Conservatory under prof. Jan Hora. He studied organ improvisation under prof. Jaroslav Vodrážka. In the period of 1980–1985 he was the organist in the cathedral of St. Bartolomeus in Plzen, in 1985–1990 in St. Margaret’s Basilica at the Benedictines Abbey in Prague – Břevnov. Since 1990 he has been the Director of sacred music of the Premonstratensian Royal Canonry, in the Basilica of Assumption of the Virgin Mary in Prague Strahov. He founded a choir and orchestra Collegium Strahoviense there and he acts as his Artistic Manager and Conductor.
He is known as an outstanding improvisator, he won the first prices for organ improvisation in two national competitions (1982, 1988). So far he played concerts in the Czech Republic, Germany, Austria, Hungary, the Netherlands, Italy, Spain, France, Poland, Romania, Moldova, the U.S.A and Japan.
Roubal has recorded a number of CD, he is an author of film music, cooperates with Czech Radio, as well as with radio organizations in Germany, Netherlands and Japan, in recording music on historical organ instruments.
In 2007 he played a special concert for the First Lady of the U.S.A. – Madame Laura Bush, during the official visit of the President of the U.S.A. to Prague, Czech Republic.