Hi Pim. Do you mean originally in English? Spanish? Spanish translated into English? Try googling and amazoning. I turned up this one which I'd never heard of:
http://www.amazon.com/gp/product/1569473048/104-6377399-5832738?v=glance&n=283155 Also, a long time ago I read The Escape Artist by Jonathan Holland - who now writes an insightful blog:
http://www.puertadelsolblog.com/ If you mean in Spanish there are thousands, and if in English translated from Spanish, well there must be hundreds.
But, though not strictly a novel, the autobiographical trilogy The Forging of a Rebel by Arturo Barea is a wonderful read. It was first written in English, I believe, by the writer in exile in the UK and then translated into Spanish and takes the reader from the slums of Lavapies in 1900 to Madrid under siege during the civil war.