I don't know why not given the definition of the word "abroad"...
http://dictionary.cambridge.org/dict...english/abroad
abroad adverb [ after verb ] (OTHER COUNTRY)
in or to a foreign country or countries:
http://www.merriam-webster.com/dictionary/abroad
1 : over a wide area : widely
2 : away from one's home
3 : beyond the boundaries of one's country
4 : in wide circulation : about
5 : wide of the mark : astray