Sinas was born in Butuan. He spent most of his teenage years in Mindanao due to the assignments of his father, who is a military officer. At the encouragement of his father, he entered the Philippine Military Academy, and graduated from the institution in 1987 as part of the Hinirang class.
Career
Central Visayas chief
Sinas was police chief of the Philippine National Police's Police Regional Office 7, which had jurisdiction over Central Visayas, for one year and four months. He worked under the office from July 2018 to October 2019.
Sinas was reassigned to Metro Manila in October 2019. His appointment as chief of the National Capital Region Police Office was announced on October 10, 2019. and formally assumed the position on October 16, vowing to tackle illegal drugs, bribery, and gambling in Metro Manila. He succeeded Guillermo Eleazar, who was appointed as chief of the PNP Directorial Staff. By November 2019, 143 police officers from Central Visayas were reassigned to Metro Manila police office. One of the transferred personnel was assigned as the office's intelligence officer, though Sinas did not enact other leadership changes at the time. Sinas launched a biometrics system for the NCRPO on December 2, 2019 for accurate attendance monitoring of the police office's personnel. He oversaw police response to the COVID-19 pandemic in Metro Manila, one of the most hardest hit regions of the pandemic. However, his stint as Metro Manila chief was marred by a controversy over an organization of a mañanita for his birthday on May 8 at Camp Bagong Diwa. A mañanita is a tradition in the police where senior officers are greeted by their personnel in the early morning of their birthdays. The holding of the occasion had negative reception from the public with the leadership of the Philippine National Police, filing charges against and eighteen other officers him for violation of the Bayanihan to Heal as One Act, particularly on provisions concerning social distancing and mass gathering at the time. Although Sinas keeps his post due to "emergency situation" concerning the pandemic, the police agency is concerned that his programs related to COVID-19 response might be disrupted. Sinas has apologized for the event though he insisted that his office observed appropriate protocols. On May 20, President Rodrigo Duterte decided against dismissing Sinas or transferring him to another post, vouching for his character believing that he was not at fault for being "serenaded" during his birthday. On July 18, Sinas and other armed NCRPO officials were accused of harassment by the Delos Santos family, with the incident being filmed by a CCTV camera and the footagegoing viral online. The NCRPO are allegedly attempting to evict the Delos Santos family from the property which will be used to build a quarantine facility for COVID-19 patients. Sinas explained that the property is owned by the PNP, and that the family's patriarch, Executive Master Sergeant Arnel Delos Santos, was allowed to live there temporarily with an agreement to vacate property after his retirement in November 2018.
