Tener la cabeza en otro sitio

[ROBINDESBOIS]

Meaning I was thinking of something else, or I was absent-minded. Do you have an expression with "head" like my head was somewhere else.?

[poli]

Yes that's it. More often we use mind instead of head.

[ROBINDESBOIS]

GRACIAS POLI; De dónde viene Poli, de polifacetico de policia ?

[Tomisimo]

I agree with Poli.

Tienes la cabeza en otro sitio.
Your mind is elsewhere.