Wildfire is a kind of disaster that can damage living creatures and environment as well as cause small dust affecting to health of people. Wildfire can be naturally occurred and human’s actions. This research aims to evaluate burned areas caused by wildfires in Omkoi Wildlife Sanctuary. The research was conducted by collecting data from Sentinel-2 Satellite for 4 years started from 2017 to 2020. Three formats of spectral indices, i.e., NBR, NDWI, and RBR were used for evaluating burned areas caused by wildfires. Validation was tested by using statistical methods. The results revealed that burned areas from 2017 to 2020 were 0.107 km², 1.160 km², 0.387 km², and 1.031 km², respectively. The larges burned area was found in 2018 followed by 2020, 2019, and 2017. For validation, it was found that total accuracy of 2017 was 93.33 % with Kappa statistics of 0.87 whereas total accuracy of 2018 was 78.33 % with Kappa statistics of 0.57. In 2019, total accuracy was 81.67 % with Kappa statistics of 0.63. In 2020, total accuracy was 76.67 % with Kappa statistics of 0.53.