There is provided a water supply control apparatus for an ice maker and method thereof. In the apparatus and method, an ejector pushes out ice, a sensor detecting portion is formed on the ejector, and at least two sensors detect a sensor transit time for the sensor detecting portion to travel from one of the sensors to the other. Therefore, an adequate amount of water can be supplied to the ice maker to make ice with a desired size regardless of the variation in the water pressure of a water inlet line from a household water source.