Sandoval was a graduate of the Philippine Military Academy's Class of 2005. He was a graduate of Bauan High School now Bauan College class of 1996.
Marawi siege
Sandoval had spent over three months in the siege of Marawi without losing a single one of his men. His command, the 11th Scout Ranger Company, had not had a single casualty since their deployment. In August 2017, he had saved a group of Scout Rangers who had been trapped in a building in the main battle area. Under his instructions, they had exfiltrated the building using an armored personnel carrier and escaped the Maute group.
Death
On 10 September 2017, Sandoval's company was tasked with retaking a stronghold of the Islamic militants. The building, a 5-storey commercial complex called C&D Centerpoint, was occupied by a branch of the Land Bank of the Philippines prior to the siege. It was referred to by the Philippine military as part of the militants' final defensive position and was defended by more than 26 militants. Sandoval's men began clearing the building from top to bottom. After clearing the fifth to the second storeys, they were about to enter the ground level when a burst of gunfire wounded Corporal Jayson Mante. His two other companions managed to quickly withdraw to the safety of the building's second storey, but Mante's injury prevented his own escape. Several failed attempts to rescue Mante transpired, during which time he was wounded several more times. At this point, Sandoval himself found an alternate route by which to approach and rescue Mante. He ordered his men to provide suppressive fire while he and another soldier, Private First Class Sherwin Canapi, attempted the rescue. As he reached the wounded soldier, Sandoval checked the latter's pulse and tried to pull him to safety. Sandoval was first wounded in his side. He returned fire but was then shot in the cheek, which proved fatal. He managed to crawl on top of Mante, shielding him from enemy fire. His body was later found to have bullets lodged in the chest, proving that he had protected Mante from getting further hit. Canapi was also killed in the rescue attempt. Captain Sandoval was buried at the Libingan ng mga Bayani on 15 September 2017. He was conferred the Armed Forces of the Philippines Medal of Valor, the highest award conferred to members of the AFP, on 20 December 2017.
Personal life
Sandoval was married to Maria Ana Rosario "Ani" Ello Sandoval. He was said to have been a talented artist; an illustrator, painter and wood carver who also had a passion for bonsai.
