Enables the transfer of a solute or solutes from one side of a membrane to the other according to the reaction: nucleoside(out) + Na+(out) = nucleoside(in) + Na+(in).
Reactome:R-HSA-9751037 "SLC28A2,3 cotransport 6MP and Na+ from extracellular region to cytosol"; Reactome:R-HSA-9754934 "SLC28C2,3 cotransports RBV, Na+ from extracellular region to cytosol"; reactome:R-HSA-109530 "Concentrative transport (import) of a nucleoside and a sodium ions by solute carrier family 28 (sodium-coupled nucleoside transporter), member 1"; reactome:R-HSA-109538 "Concentrative transport (import) of a nucleoside and two sodium ions by solute carrier family 28 (sodium-coupled nucleoside transporter), member 3"; reactome:R-HSA-109539 "Concentrative transport (import) of nucleosides plus sodium ions by solute carrier family 28 (sodium-coupled nucleoside transporter), member 2"