Is it possible to solder this non-standard package (sim900) using hot-air station?
Without the BGA pads, that's just a QFN package with 1 mm pitch.  Yes, you can solder that with a hot air station.

The way I usually do this is to use a soldering iron to put a bead of solder on all the pads.  Then smear paste flux over everything and position the chip over the pads as accurately as you can.  A mag light is handy for this.  The paste flux acts like goo to hold the chip in place.

Now heat with hot air at around 700&deg;F.  Make sure you have reasonable air flow, but no so much that the force of the air can move things around.  For a package this large, you need to have one of those nozzles that has a long and thin vent for each side of the package.  Be careful to hold the hot air wand steady and centered over the package.  It may take 5-10 seconds, but you should see the solder melt.  Make sure it is melted all around on all four sides, give it maybe another 2 seconds like that to be sure, and remove the air.

It is important that the solder on all pads be molten at the same time.  Molten solder has significant surface tension.  In the beginning, some of the pads will be molten, which pulls the chip down against the remaining pads harder.  This is how the process deals with the inevitable mismatch of a higher solder beads than others.  Once the solder on all pads is melted, they all pull together to line up the chip nicely with all its pads.