Increasing nutrient demand in parallel with population growth makes it necessary to carry out more crop production every year as a result of loss of crops after production due to decreasing urbanization and wrong land use of agricultural areas and other reasons. Irrigation is one of the most important applications to increase the quantity of products to be obtained from the unit area. Regular and controlled irrigation practices increase the efficiency obtained from the unit area, but also damage to the environment as a result of excessive water use is significantly reduced. Besides, knowing the amount of water in the soil is important in terms of irrigation water requirement and irrigation scheduling. Thanks to the developing technology, the measurement of soil moisture has started to be done mostly using soil moisture sensors rather than the gravimetric approach. A number of soil moisture sensors have been developed for this purpose. These sensors are classified under TDR (Time Domain Reflectometry), FDR (Capacitance or Frequency Domain Reflectometry), TDT (Time Domain Transmissometry) and neutron probe in terms of operating principle. The use of FDR based soil water content sensors has increased due to the lower cost and increased reliability of measurement in recent years. In this study, it is aimed to determine the types of soil moisture sensors that have been widely used and the importance of these sensors in terms of sustainable agriculture.