The inventive concepts provide an apparatus for manufacturing a semiconductor package and a method for manufacturing a semiconductor package using the same. The apparatus includes a mold unit with a cavity formed by an inner space of the mold unit. The mold unit includes a first mold, a second mold coupled to the first mold, a supply part supplying a molding resin into the cavity, and a vent part disposed to be opposite to the supply part. The vent part includes a first vent part fixed in the mold unit, and a second vent part movable with respect to the first vent part.