Sulfur-doped disordered carbon is facilely synthesized and investigated as an anode for sodium ion batteries. Benefiting from the high sulfur doping (∼26.9 wt%), it demonstrates a high reversible capacity of 516 mA h g⁻¹, excellent rate capability as well as superior cycling stability (271 mA h g⁻¹ at 1 A g⁻¹ after 1000 cycles).