Bangsaen has been a famous beach destination for both Thai and international visitors. In 1943, Not many people knew Saensuk, except the Sam Muk Mountain community, which consisted of only 3-4 households during King Rama V. Community members were fishermen. The Sam Muk Mountain community, at that time, looked like an island located on seashore. In the middle of the mountain had tropical rain forests. Lots of monkeys and snakes could be found. A reputable house shrine was located on the west side. The Sam Muk Moutain community became developed when Field Marshal P.Pibulsongkram built his weekend house on the west side of the mountain during 1943-1945. He also built houses for government important guests from abroad, housesforgovernment officials and roads from Bangsaen to Sam Muk Mountain.

In 1960, Field Marshal Sarit Thanarat built new houses for governmental purposes at Laemtaen (the southwest of the Sam Muk Mountain). Government meetings were often held there. Previous government houses in the Sam Muk Mountain were abandoned ultimately.

The Saensuk Sub-district Municipality, local administration organization, was renamed in November 26, 1988 chaired by Somchai Kunpluem. Its area was enlarged from 2.5 square kilometers (15 villages) to 20.268 square kilometers (20 villagers). Due to capabilities of the municipality as well as the mayor, development was brought to the Saensuk Sub-district Municipality. In 1993, it was awarded as a “tourist destination city” and received financial supports from different organizations such as Tourism Authority of Thailand, Ministry of Science and Technology, Chonburi Provincial Administration Organization, Department of Provincial Administration and etc. The Saensuk Sub-district Municipality spent money to deliver consistent development.