A wave is a transmission of disturbance from one point to another.
It involves transfer of energy from the source to other points.
Mechanical waves such as sound waves require a material medium for transmission.
Transmission of energy in mechanical waves is due to the vibration of particles in the medium which enhance transmission of kinetic energy from one point to another in the medium.
Therefore, since vibrating particles possess kinetic energy, then energy transferred by a wave in a medium is kinetic energy.
