Not sure if this is a complete list, but these are the ones I have seen listed as sand sifters.
Of course a lot will depend on what's available in your area.
Diamond Watchman Goby
(Valenciennea puellaris)
Two Spot Goby
(Signigobius biocellatus)
Tiger Watchman Goby
(Valenciennea wardii)
Sleeper Gold Head Goby
(Valenciennea strigata)
Sleeper Banded Goby
(Amblygobius phalaena)
Engineer Goby
(Pholidichthys leucotaenia)
Sleeper Blue Dot Goby
(Valenciennea sexguttata)
Orangemarked Goby
(Amblygobius decussatus)
Sleeper Railway Glider Goby
(Valenciennae helsdingeni)
Sleeper Striped Goby
(Valenciennae longipinnis)
I have a sleeper gold head goby and he is a very active sifter. Had a huge sandstorm with cloudy water for the first couple weeks after getting him. I also have an orangemarked goby in another tank. So far not nearly as active as the gold head and no sandstorm either, but he has just really gotten comfortable in the tank within the last 3 or 4 days.
As far as mixing gobies, I had heard about that. I have a court jester goby in the same tank as the orange marked goby and they haven't had any problems yet. But it has just been a week so that may change.