Why don't water molecules react alongside aqueous reactions?
why don't some of the water molecules present in the aqueous solution of $\ce{CuSO4}$ also react with the sodium (Na) to form sodium hydroxide and hydrogen ($\ce{NaOH + H2}$)


I agree that sodium metal would react with the water.  Where/how did you come up with the equation implying otherwise?

I think you'll enjoy this video: https://www.youtube.com/watch?v=X5yLtqlopTM