D. psammophis is endemic to Australia, found throughout the continent in a variety of habitats from coastal fringes to interior arid scrubland.

The genus Demansia is commonly found in the Southern hemisphere around Australia and equatorial countries such as Papua New Guinea.

It grows up to a total length (tail included) of 1 m (39 in), averaging around 80 cm (31 in), females being slightly smaller than males.

[5] Characterized by its narrow yellowish head, pale ring around the eyes, and a dark marking curving along the upper lip,[6] D. psammophis becomes distinguishable from other Demansia snakes.

[6] To accurately identify this species, there must be a clear view of the head, and the dorsal scales at the snake's mid-body must be counted.

[8] D. psammophis is commonly confused with the eastern brown snake (Pseudonaja textilis), due to their similar appearance.

[5] The yellow-faced whip snake is subject to brumation, or slowing down its movements, in the winter months, usually only moving to seek sun and water.

However, as they become adults, constriction becomes uncommon, with the species occasionally creating a single body loop to restrain its prey.