No, you cannot separate the electric field from an electromagnetic wave. An electromagnetic wave is composed of mutually perpendicular electric and magnetic fields that are coupled and inseparable. They are interconnected and propagate together as a wave through space.
According to electromagnetic wave theory, a changing electric field induces a magnetic field, and a changing magnetic field induces an electric field. This mutual induction allows the wave to sustain itself and propagate.
The electric field and magnetic field in an electromagnetic wave are interdependent and exist in a synchronized manner. They oscillate perpendicular to each other and to the direction of wave propagation. As the wave travels through space, the electric and magnetic fields continuously create and support each other.
Therefore, attempting to separate the electric field from an electromagnetic wave would be akin to separating one half of a mutually dependent pair. The two fields are intimately linked and cannot be completely isolated from each other in an electromagnetic wave.