No, sound waves themselves are not subject to time dilation. Time dilation is a phenomenon predicted by Einstein's theory of relativity, which states that the passage of time can be affected by differences in gravitational fields or relative velocities.
Sound waves, on the other hand, are a propagation of mechanical disturbances through a medium, typically air. They are not directly influenced by gravitational fields or relative velocities in the same way that light or other electromagnetic waves are affected by these factors.
However, it's worth noting that the perception of sound can be influenced by time dilation in certain situations. For example, if an observer is moving at a significant fraction of the speed of sound relative to a stationary sound source, the Doppler effect can cause a change in the perceived frequency and pitch of the sound. This is similar to the change in frequency observed with the Doppler effect for light, which can be influenced by relative velocities.
In summary, while sound waves themselves are not subject to time dilation, the perception of sound can be affected by relative velocities and the resulting Doppler effect.