In response to the growing demand for critical current density (Jc) in superconducting wires, Sn-Ge co-doped Nb3Al wires were fabricated by the rapid-heating, quenching and transformation (RHQT) method. Physical Property Measurement System-Vibrating Sample Magnetometer (PPMS-VSM) was used to perform magnetic measurements at low-temperature and external field to estimate Jc and superconducting transition temperature (Tc). Backscattered electron (BSE) image acquisition and EDS analysis of the polished surface by FESEM were used to determine phase homogeneity and elemental distribution. A significant positive correlation was found between Jc (up to 7 T at 8 K) and ΔTc. Compared with binary sample, doubled Jc was obtained in the low-dose Sn-Ge co-doped Nb3Al wire, reaching 3.01 × 103 A/mm2, 1.46 × 103 A/mm2 and 0.39 × 103 A/mm2 at 5 T and 8 K, 10 K and 12 K, respectively. The increase in Jc can be attributed to the enhancement of the homogeneity of the superconducting phase, especially the distribution of Al element therein.