I just graduated with a major in history and commissioning as a 2LT ,Transportation corp, in the army. I am obsessed with military endeavors and the art of warfare. I'm a little stuck on finding books outside of Clausewitz and Joseph Sinclair.
Is there a particular time period you're interested in? This is an enormously huge field of study that is really broken down by time period and even, at times, countries. In general I will say there are not very many books focused wholly on transportation and logistical science earlier than 20th century conflicts and, even then, don't expect much before WWII. For instance, pretty much the only works I know of that go into logistics as a major subject in the early-modern period are
Parker, Geoffrey, The Army of Flanders and the Spanish Road, 1567-1659: The Logistics of Spanish Victory and Defeat in the Low Countries' Wars
Elting, John, Swords Around a Throne: Napoleon's Grand Armee
But even in the latter case, it's more a book about the inner workings of Napoleon's entire force and that includes talk about the logistical aspect of things. Like Hew Strachan's The First World War: Volume I, To Arms may not be necessarily a military science work overall, it still has major components that deal with logistical discussion. So in general you'll find a lot of this discussion is nested in greater discussions of grand strategy of certain conflicts.
Now if you'd like more modern military theorists of the likes of Clausewitz I'd recommend Antoine-Henri Jomini, whose writings defined military science arguably more than Clausewitz for many in the 19th century and was incredibly influential on, say, Union military doctrine. See Carol Reardon's With a Sword in One Hand and Jomini in the Other: The Problem of Military Thought in the Civil War North for more on that alst bit. Alfred Thayer Mahan's work on naval power and force projection is easily up there as one of the most influential works in military science. Giulio Douhet is also incredibly important in aerial doctrine -- his works coming in the '20's and predicting the rise of mass terror bombings and rather overestimating the power of the air force though. Regardless a wonderful work on military science itself.
But again, if you want logistics and transportation on specific subjects it would be more helpful to know what you're interested in particularly as there isn't a lot out there. You may need to get a specific military history work that discusses that in part.