No it's not sadism. Sadism means that you gain satisfaction (often sexual) by hurting somebody. Schadenfreue is just the amusement over somebodies misfortune.
I also found this word "epicaricacy". It according to the wiktionary (http://en.wiktionary.org/wiki/epicaricacy) it is a synonym of schadenfreude. I think I found my word.
I also found this word "epicaricacy". It according to the wiktionary (http://en.wiktionary.org/wiki/epicaricacy) it is a synonym of schadenfreude. I think I found my word.