Two options:
1) a simple siphon hose: fill a hose with water, keeping one end underwater in the pool, plugging the other end with your hand pull the hose end over the side of the pool and move to where you want the drain/vacuum water to go.
2) Use some adapters to connect the pump inlet to a pool vacuum like in a traditional pool. Your pump will only be able to move what it can, and pool vacuums need decent flow to be effective. I do this with my Intex pool with a 1000gal/hr pump which works well enough. I use a series of abs & pvc plumbing parts to bring the 4" inlet screened cover down to a 1-1/2" pipe--something my vacuum hose will slip into. The screened cover for the pump inlet is just a touch smaller than the 4" to 2" abs adapter, so a few layers of electrical tape made the diameter just slightly bigger to slip the adapter over snugly. This setup cost me just about $40 including the hose, vacuum head and plumbing bits.