Nope. Sound is a longitudinal wave. At least that is what it was taught to me in school. This is an example of how we all become stupid. The schools aren't teaching the same information across the board. Then no one agrees.
But go back to the beginning. Please give me a scientific definition of what a scalar wave is. And quote your source.
Sound is a longitudinal wave (though in solids, it can be transverse). It's also a pressure wave. Pressure is a scalar quantity, because it has no direction associated with it. I just think you're unwilling to accept mainstream science to the point where you'll disbelieve anything.
I would agree that pressure by itself could be a scalar quantity. Since that is only a magnitude without any preferred direction. But a sound wave radiates away from the source. It now has direction. And since sound acts like repetitive pulses of pressure, you now have a magnitude that is changing in magnitude with direction. That appears to be categorized now as a vector quantity. Since the instant you add direction to a magnitude, by definition it becomes a vector quantity.
In all honesty, in our universe, scalar quantities can only exist in the minds of men. Everything appears to have some direction associated with it. The addition of the flow of time makes every quantity a vector. All magnitudes have a time direction.