How to Say "clumsy person" in Spanish
The Spanish word for “clumsy person” is “paquete” — B2 level.
English → SpanishB2
nounB2informal/slang
someone inept, especially at sports

Examples
No lo pongas a jugar al fútbol, es un paquete.
Don't put him in to play soccer, he's totally clumsy/inept.
La película fue un paquete, me aburrí muchísimo.
The movie was a bore (a dud), I got incredibly bored.
Using 'Ser' vs 'Estar'
Since this refers to a permanent quality (being inept or boring), you use the verb 'ser' (e.g., 'es un paquete').
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