No.
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Shedinja does not evolve any further than its current stage.
Once Nincada reaches level 20 it can evolve into Ninjask. However, if you have an open spot on your team another Pokémon Shedinja will appear also.
You evolve a ninjask with room in your party pretty simple really
Ninjask cannot evolve any further. If you are meaning Nincada, it can evolve into Ninjask at level 20, but it can also evolve into Shedinja, if you have an empty party slot and a Pokeball with you.
Nincada evolves into ninjask at level 20, but you have to leave an open space in your party because after Nincada evolves, a Shedinja appears. My Shedinja appeared at level 27 with a max HP of 1. But this isn't a problem because Shedinja's "wonder guard" prevents any critical attacks.