Answer: Yucca normally grows outdoors in full sun and is a hardy plant so I am a bit surprised you have it as a houseplant. Could it perhaps be a draceana instead? In either case, based on your description I would suspect you might be overwatering it, especially if it is experiencing lower light levels than it was accustomed to before you brought it home. Water so that the soil is moist, not sopping wet, and then wait until the soil has fully dried to about an inch below the surface before you water again. Most plants go through an adjustment period when they change environments, so the leaf drop should stop once it has become acclimated. Also examine it carefully for pests -- check the undersides of the leaves and the stem under a bright light.
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