Two new gastrotrich species belonging to genus Tetranchyroderma are described on the basis of the specimens from intertidal or sublittoral sand bottoms of South Korea. Tetranchyroderma heterotentaculatum, n. sp. is clearly differentiated from its congeners by the character combination: the cuticular armature with pentancres, modified rod-like cephalic tentacles, and three pairs of dorsolateral adhesive tubes. Tetranchyroderma hoonsooi, n. sp. possesses tetrancres, paired lateral cephalic tentacles, and ventro-lateral adhesive tubes along whole lateral margin, while lacks dorsal adhesive tubes. Affinities with its congeners and variability within the species are discussed, with brief notes on morphological discrepancies between adults and juveniles.