Can you volley the return of serve in beach tennis?

Yes. In beach tennis the receiver may volley the serve (play it before it bounces) from any position on the court. There is no rule requiring the receiver to let the serve bounce.

Full Explanation

Per ITF Beach Tennis Rules, there is no requirement for the receiver to let the serve land before playing it. Because the fundamental rule is that the ball must not bounce at all (Rule 9.3), the receiver may and typically must intercept the ball before it touches the sand. The serve must land in the correct service box; if it does and the receiver volleys it, the rally continues normally. If the serve is good and the receiver's volley goes out or into the net, the receiver loses the point. This is one of the key differences between beach tennis and padel, where a bounce before return is common.

Ruleset: ITF  |  Rule Reference: ITF Beach Tennis Rules, Rule 7 and Rule 9.3