The Wandering Thomasomys occurs in the Cordillera Oriental of north-central Ecuador. It has long, soft fur and has been collected in forests at 1,900–3,600 m.
Its long, soft dorsal fur is grayish brown, paler along the sides. The long tail ends in a small whitish tuft.
It has been collected in dense secondary vegetation and subalpine and upper montane rainforest in Ecuador, on the ground among wet leaf litter and moss, beneath mossy logs, branches, or roots, and inside hollow trunks.
An extinction-risk assessment has not been added yet.