This is gramatically/semantically/logically wrong so let's see some possibilities for the correct version:
"Él no es yo" =He's not me. (Maybe the person got confused and mixed them all up)
"Él, no soy yo"= As in A: Who's bothering me? B: Él, no soy yo.
"el no soy yo"= As in: el "no soy yo" la del problema es un claro ejemplo de inmadurez.
Saludos!