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I solved it alone because there's nothing about it on the wiki or other pages (only python)
For who will be in my same situation, I post some code snippet
Here is what is needed to be included

#include <actionlib/client/simple_action_client.h>
#include <sound_play/SoundRequestAction.h>

The definition of the Action Client

typedef actionlib::SimpleActionClient<sound_play::SoundRequestAction> SoundClientTest;

The definition of the Sound Client Goal

sound_play::SoundRequestGoal goal;

All the other things are the same as, for ex, the move base action client.
I hope this could be helpful