A construction method of a clay ground sand mat through a sand mat model test and a numerical analysis is provided to prevent the clay layer from being disturbed and improve draining efficiency of the clay layer by increasing supporting force of the soft ground improvement. A construction method of a clay ground sand mat is composed of a step of predicting the final sinking extent of a soil center part(SOf) and a soil slope part(SDf); a step of increasing the moving gradient and lowering the horizontal draining of the sand mat by viewing the behavior of the sand mat pore water through the sand mat model loading test; a step of filling a sinking compensating soil of as much as the final sinking extent of the soil center and slope parts on the upper end of the original clay ground; a step of paving with the average sinking amount; and a step of paving the sand mat on the upper side with a predetermined thickness.
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