From the Super Mario Wiki
Shifting Sands is a desert in Mario Golf: Toadstool Tour and Mario Pinball Land. It is very similar to Shifting Sand Land from Super Mario 64 and Dry Dry Desert from Paper Mario.
Mario Golf: Toadstool Tour
The Shifting Sands course is filled with many sand dunes and sand traps, along with some cracked ground that does not make the ball go far at all. Throughout the course, the player is taken through ruins, pyramids, cliffs, sphinxes, and a small water hole at hole fourteen, while Kleptos fly around once in a while. In the last few holes in the course, it becomes evening, at which time the winner is announced when everyone's done.
Mario Pinball Land
Mario unearthing the pyramid of Shifting Sands in Mario Pinball Land
Mario fighting the mysterious King Tut.
In Mario Pinball Land, Shifting Sands was one of the worlds Mario went to. Here, Mario fought Pokeys, Lakitu and his Spinies, and Kleptos. He also found King Tut's pyramid. In there, he went up against many Cobrats and Shy Guys (there were also two of Toad's Tents here, on the left and right sides). When Mario finally made it to the inner sanctum, he awakened King Tut himself and fought him. Using his magic against him, Mario defeated Tut and took his Star Key to move on.