GO:0033871:   [heparan sulfate]-glucosamine 3-sulfotransferase 2 activity
Catalysis of the reaction: 3"-phosphoadenylyl sulfate + [heparan sulfate]-glucosamine = adenosine 3",5"-bisphosphate + [heparan sulfate]-glucosamine 3-sulfate; modifies selected glucosamine residues preceded by GlcA2S.