I'd like to add a laundry sink in our laundry room. The existing outlets are non-GFCI connected to a 20-amp circuit breaker. There's also the outlet for dryer if 220v connected to a double-pole 30-amp circuit breaker. Do all those outlets need to be converted to gfci?

Just the standard 120V receptacles.

Just to add a little more information:

Any receptacle within a six foot arc of the sink must be protected by GFCI. The GFCI protection can take the form of a GFCI recepatcle that also protects receptacles that are downstream of it or a GFCI breaker that protects the entire circuit.

You do not need to place a GFCI receptacle in each outlet.