The wave focusing technique is one of the existing methods to simulate rogue waves in the laboratory, however most of these methods are based on a linear back transformation of the target wave from the desired location to the position of the wave maker; this means that non linear effects due to wave-wave interaction are neglected during this process, resulting in differences between the expected and the recorded focused wave at the focal point. Besides, these methods are developed to generate focused waves over a flat bottom and cannot be directly used for variable water depth. Hence, in this paper a self correcting method to produce the focused wave at a predefined position is developed. The methodology is found to be very simple and efficient. Further, one could easily adopt this methodology in any of the existing wave generation system. The developed methodology is tested in a numerical wave tank for constant and variable water depth.

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