  We present millimeter interferometric observations of the molecular envelope
around the red supergiant VY CMa with the SubMillimeter Array (SMA). The high
angular resolution (< 2'') allows us to derive the structure of the envelope as
observed in the 1.3 mm continuum, 12CO(2-1), 13CO(2-1) and SO(6,5-5,4) lines
emission. The circumstellar envelope is resolved into three components: a
dense, compact and dusty central component, embedded in a more diffuse and
extended envelope plus a high velocity component. We construct a simple model,
consisting of a spherically symmetric slowly expanding envelope and bipolar
outflows with a wide opening angle (~ 120 deg.) viewed close to the line of
sight (i = 15 deg.). Our model can explain the main features of the SMA data
and previous single-dish CO multi-line observations. An episode of enhanced
mass loss along the bipolar direction is inferred from our modelling. The SMA
data provide a better understanding of the complicated morphology seen in the
optical/IR high resolution observations.
