Exclusion from communion is excommunication. Perhaps you have something else in mind?
No, it is not.
From: http://www.newadvent.org/cathen/05678a.htm (Catholic Encyclopedia) --
Excommunication (Latin ex, out of, and communio or communicatio, communion — exclusion from the communion [They're not talking about the Eucharist here]), the principal and severest censure, is a medicinal, spiritual penalty that deprives the guilty Christian of all participation in the common blessings of ecclesiastical society.
Notice the wording of the final underlined portion. That goes far beyond the Eucharist. Sibelius is forbidden to receive the Eucharist, not "all participation".