Perhaps this is possible by changing ocean currents through salinity
Disclaimer: This answer is all based on this article. I am not a climate scientist so perhaps others can argue otherwise.
How salty the ocean water are seems to effect how the currents carry heat.
On Earth, as the warm currents of the Gulf Stream reach the Arctic, they cool and sink, concentrating salt water into a supercooled briny current that flows along the ocean floor down towards the South Pole where more currents eventually bring those cold salty waters back up towards the surface. They eventually warm up, and start venturing north again, this time on the surface of the ocean.
If we dramatically increase the salinity of the water:
Our research shows that oceans on other planets with a much higher salinity could circulate in the opposite direction--with polar water flowing towards the equator at the surface, sinking in the tropics and traveling back towards the poles at depth. We also found a similar pattern emerging for freshwater oceans." Manoj Joshi, an author of the paper said "These circulation patterns are the opposite of what happens on Earth, and would result in a dramatic warming in the polar regions."
So this gives us a method for warming up the poles, not necessarily cooling the equator though. All we need is another method such as a higher altitude to cool the equator.