oh yes, it would sound very poetic ,
even if I think that "sospiro" could better translate the word "sigh" (German: "Seufz"... Do you know the "Ponte dei Sospiri" (the Bridge of Sighs) in Venice? The word "Sehnsucht" reminds me the verb "sehnen" (def.: to want/long fervently/passionately to see..)...