  Compact stellar objects such as neutron stars (NS) are ideal places for
capturing dark matter (DM) particles. We study the effect of self-interacting
DM (SIDM) captured by nearby NS that can reheat it to an appreciated surface
temperature through absorbing the energy released due to DM annihilation. When
DM-nucleon cross section $\sigma_{\chi n}$ is small enough, DM self-interaction
will take over the capture process and make the number of captured DM particles
increased as well as the DM annihilation rate. The corresponding NS surface
temperature resulted from DM self-interaction is about hundreds of Kelvin and
is potentially detectable by the future infrared telescopes. Such observations
could act as the complementary probe on DM properties to the current DM direct
searches.
