The present invention relates to a system and method for detecting a terrain by using an IoT sensor that guides a putting distance compensated according to a gradient and a putting direction compensated according to a gradient. The present invention enables a user to carry out accurate putting, and comprises: a first sensor unit that detects a terrain state of a location of a user; a second sensor unit that is capable of communicating with the first sensor unit, and detects a movement distance of the user; a third sensor unit that detects a starting point of the user, is capable of communicating with the second sensor unit, and includes a magnet member; a management server that manages a deep learning algorithm for the terrain state and the movement distance; and a user terminal that is capable of communicating with the management server via a network, transmits, to the second sensor unit, the deep learning algorithm managed by the management server, receives, from the second sensor unit, information regarding the location and exercise condition of the user, and displays the information.