We studied the diffusion process of a single SIA in a-iron using a hyper-MD method with a local bias potential that has been demonstrated to efficiently accelerate slow diffusive conformational transitions that occur in various materials. Through a comparison with a conventional MD simulation, it was shown that the hyper-MD method can significantly accelerate the dynamics of SIA diffusion over a wide range of temperatures (300–1400 K) without changing the dynamics of the diffusion process as calculated using a conventional MD simulation. The successful application of the hyper-MD method with an appropriate local bias potential for the simulation of a rare event such as single SIA diffusion at low temperature demonstrates that this method is a valuable tool and will lead to the use of this algorithm for other systems.