Beach by the Lou'Lou'a Beach Resort, Sharjah

One of Sharjah's free beaches. It's located to the right of the Lou'Lou'a hotel. It's usually uncrowded and clean here.
The beach is sandy and unequipped, meaning there are no sun loungers or umbrellas, but there also aren't many people, so you can sunbathe while enjoying the sound of the bay.
If you want to rent sun loungers and umbrellas, walk around the hotel to Al Khan Beach, which has all the amenities: toilets, showers, and changing cabins. There are cafes nearby, though prices there are a bit inflated. There are grocery stores near both beaches.

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