Silver(I) complexes with sulfur-donor ligands have a broad range of pharma­cological applications. One of the most important factors for tuning the biological activity is the type of donor atom and the ease of ligand replacement. Silver thio­saccharinates display a wide range of structures from mono- to polynuclear complexes. We report the synthesis, crystal structure and vibrational spectroscopic analysis of a two-dimensional Ag^I-thiosaccharinate coordination polymer, namely poly[tris­(μ₂-4,4′-bipyridine-κ²N:N′)bis­(μ₃-1,1-dioxo-1,2-benzisothiazole-3-thiolato-κ₃N:S₃:S₃)bis­(μ₂-1,1-dioxo-1,2-benzisothiazole-3-thiolato-κ²S³:S³)tetrasilver(I)], [Ag₂(C₇H₄NO₂S₂)₂(C₁₀H₈N₂)_1.5]_n, with 4,4′-bipyridine acting as a spacer. A relevant feature of the structure is the presence of an unusually short Ag⋯Ag separation of 2.8859 (10) Å, well within the range of argentophilic inter­actions and confirmed as such by Raman analysis of the low-frequency spectrum. From a topological point of view, the structure presents inter­penetration in the form of a threefold entangled 2D → 2D mesh (2D is two-dimensional).