Symporter that selectively cotransports sodium ions and amino acids, such as L-glutamine and L-asparagine from the lysosome into the cytoplasm and may participates in mTORC1 activation (PubMed:28416685, PubMed:35561222). The transport activity requires an acidic lysosomal lumen (PubMed:28416685). {ECO:0000269|PubMed:28416685, ECO:0000269|PubMed:35561222}. This is the function of ENSG00000103042 (SLC38A7, solute carrier family 38 member 7).