Sánchez began his professional boxing career on October 4, 1991, knocking out Carlos Figueroa in round one at Mayagüez, Puerto Rico.
He then beat future world champion Victor Burgos by a decision in twelve to retain the title, in what marked the beginning of their trilogy of bouts.
Sánchez revealed that he had become a newborn Christian shortly before his next fight, an attempt at recovering the WBO world Strawweight championship, held this time by Ivan Calderón.
On January 29, 2005, Sánchez attempted to win the WBO world Jr. Flyweight title, but he lost to champion Nelson Dieppa of Vieques by an eleventh-round knockout.
After suffering an eye injury, Sánchez lost the fight by an eighth-round technical knockout, announcing his retirement from professional boxing immediately after the bout.