The Sandlünz lies in the South Harz within the South Harz Nature Park immediately southeast of Netzkater (ca. NN), which belongs to Ilfeld in the municipality of Harztor. It rises above the valley of the Bere stream, into which the Brandesbach empties, north of the wooded hill, and the Schuppenbach to the west of it. The northern and northwestern flanks of the Sandlünz are part of the Brandesbachtal nature reserve. Towards the southeast, the countryside transitions to the hills of Rabenkopf (547.4 m) and Poppenberg (600.6 m). To the south is the hill spur of Herzberg with its rock formation, the Gänseschnabel (Goose Beak). Its western neighbour on the far side of the Bere is the Netzberg, where the Dühringsklippe crags are found (504.8 m).