This title compound, [C14H20N2NaO15Sm](n), is synthesized by reacting Sm(NO3)(3) and 2,6-pdca in the presence of 1M NaOH. The 2D sheet-based complex is formed, where Sm(III) ion occupied nine coordinating sites and Na (I) ion occupied six coordination sites. The Sm(III) atom is coordinated by two pyridine N atoms and four carboxylate O atoms from two doubly deprotonated pyridine-2,6-dicarboxylate ligands in a distorted octahedral geometry. There are three water molecules coordinated with Sm(III) ions. One Na(I) cation is coordinated by three carboxylate O atoms and two water molecules and the other is coordinated by five carboxylate O atoms and two water molecules in an irregular geometry. In this complex, Na(I) cations are connected with Sm(III) ions through bridging coordinated water molecules O1W and O3W. Topologically, structure consists of layers (1 0 0) with point symbol for Na(I) ion is (3(2).4.5.6(2).7(4)) and for net is (3.4.5)(3(2).4.5.6(2).7(4)) and 3,5-c 2-nodal net with topological type is gek1.