When water body detected, it is detected along with rice fields

I am aiming for water body detection. However, it was confirmed that the water of the rice paddy was detected together.
Is there a way to make the rice paddy water undetectable?

Well, both are largely open water surfaces. You can try separating them by either polarimetric or multitemporal information.
But we need to know more about your data, the processing and so on to be able to help.

Mapping Rice Paddies in Complex Landscapes with Convolutional Neural Networks and Phenological Metrics may help you eliminate rice paddies from “water” areas.