The national park’s chief Wittaya Buapol said the area was closed to tourists because he believes a rockslide will occur again.
He has also instructed officials to put up red flags in the area and ensure no tourists are taken to the area.
"The national park is also cooperating with related agencies to investigate the area,” the department said.
Prasat Hin Pun Yod has been named a global geopark by the United Nations Educational, Scientific and Cultural Organisation (Unesco).
“This sinkhole is popular among tourists because they can enjoy spectacular views of beautiful limestone towers set in beautiful emerald-green waters. It is also popular with kayakers,” the department said.